Go-to-definition crashes when jar has plus sign in name

Somewhere along the line, the plus in the `file://` URL is converted to a space, causing a crash by a `NoSuchFileException`.

I found this while writing a minecraft mod; I made a (mostly minimal) git repo to replicate the error: https://github.com/clarfonthey/kt-lsp-bug-repro

The following is the output I get from `kak-lsp` while attempting to go-to-definition for one of the sponge classes in `CrashReport_noopMixin.kt`. I additionally have the environment variable `CLASSPATH=/usr/share/kotlin/lib/*.jar` set.

```
*** This is the debug buffer, where debug info will be written ***
kak-lsp: config-change detected:
kak-lsp: log: main Adding script definitions [ScriptTemplateWithArgs]
kak-lsp: log: main Kotlin Language Server: Version 1.2.0
kak-lsp: log: main Connected to client
kak-lsp: log: async0 Adding workspace folder null
kak-lsp: log: async0 Adding .../minecraft-test/build.gradle.kts, .../minecraft-test/settings.gradle.kts, .../mixins/CrashReport_noopMixin.kt under /home/ltdk/minecraft-test to source path
kak-lsp: log: async0 Searching for dependencies and Java sources in workspace root /home/ltdk/minecraft-test
kak-lsp: log: async0 Resolving dependencies for 'minecraft-test' through Gradle's CLI using tasks [kotlinLSPProjectDeps]...
kak-lsp: log: async0 Found gradle at /usr/bin/gradle
kak-lsp: log: async0 Successfully resolved dependencies for 'minecraft-test' using Gradle
kak-lsp: log: async0 Resolving dependencies for 'minecraft-test' through Gradle's CLI using tasks [kotlinLSPProjectDeps]...
kak-lsp: log: async0 Found gradle at /usr/bin/gradle
kak-lsp: log: async0 Successfully resolved dependencies for 'minecraft-test' using Gradle
kak-lsp: log: async0 Adding 112 files to class path
kak-lsp: log: async0 Update build script path
kak-lsp: log: async0 Resolving dependencies for 'minecraft-test' through Gradle's CLI using tasks [kotlinLSPKotlinDSLDeps]...
kak-lsp: log: async0 Found gradle at /usr/bin/gradle
kak-lsp: language server is not initialized, parking request
kak-lsp: log: async0 Successfully resolved build script dependencies for 'minecraft-test' using Gradle
kak-lsp: log: async0 Adding 495 files to build script class path
kak-lsp: log: async0 Reinstantiating compiler
kak-lsp: log: async0 Adding script definitions [ScriptTemplateWithArgs]
kak-lsp: log: async0 Configuring Kotlin DSL script templates...
kak-lsp: log: async0 Adding script definitions [ScriptTemplateWithArgs, KotlinInitScript, KotlinSettingsScript, KotlinBuildScript]
kak-lsp: log: debounce0 Linting .../mixins/CrashReport_noopMixin.kt
kak-lsp: log: async2 Go-to-definition at .../mixins/CrashReport_noopMixin.kt 4:36
kak-lsp: log: async3 Updating symbol index...
kak-lsp: log: debounce0 Linting 0 files
kak-lsp: log: async2 Re-parsing CrashReport_noopMixin.kt 0:1-14:1
kak-lsp: log: async2 Hovering DOT_QUALIFIED_EXPRESSION
kak-lsp: log: async2 Found declaration descriptor Lazy Java class org.spongepowered.asm.mixin.Mixin
kak-lsp: log: async2 Finding contents of kls:file:///home/ltdk/.gradle/caches/modules-2/files-2.1/net.fabricmc/sponge-mixin/0.10.7%20mixin.0.8.4/7a4ca9d54d9ae564dea0363d668036a8420ed9b8/sponge-mixin-0.10.7%20mixin.0.8.4.jar!/org/spongepowered/asm/mixin/Mixin.class
kak-lsp: log: async2 Finished in 1389 ms
kak-lsp: log: async2 Internal error: java.nio.file.NoSuchFileException: /home/ltdk/.gradle/caches/modules-2/files-2.1/net.fabricmc/sponge-mixin/0.10.7 mixin.0.8.4/7a4ca9d54d9ae564dea0363d668036a8420ed9b8/sponge-mixin-0.10.7 mixin.0.8.4.jar
kak-lsp: log: java.util.concurrent.CompletionException: java.nio.file.NoSuchFileException: /home/ltdk/.gradle/caches/modules-2/files-2.1/net.fabricmc/sponge-mixin/0.10.7 mixin.0.8.4/7a4ca9d54d9ae564dea0363d668036a8420ed9b8/sponge-mixin-0.10.7 mixin.0.8.4.jar
kak-lsp: log: at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:315)
kak-lsp: log: at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:320)
kak-lsp: log: at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1770)
kak-lsp: log: at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
kak-lsp: log: at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
kak-lsp: log: at java.base/java.lang.Thread.run(Thread.java:833)
kak-lsp: log: Caused by: java.nio.file.NoSuchFileException: /home/ltdk/.gradle/caches/modules-2/files-2.1/net.fabricmc/sponge-mixin/0.10.7 mixin.0.8.4/7a4ca9d54d9ae564dea0363d668036a8420ed9b8/sponge-mixin-0.10.7 mixin.0.8.4.jar
kak-lsp: log: at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:92)
kak-lsp: log: at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:106)
kak-lsp: log: at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
kak-lsp: log: at java.base/sun.nio.fs.UnixFileAttributeViews$Basic.readAttributes(UnixFileAttributeViews.java:55)
kak-lsp: log: at java.base/sun.nio.fs.UnixFileSystemProvider.readAttributes(UnixFileSystemProvider.java:149)
kak-lsp: log: at java.base/sun.nio.fs.LinuxFileSystemProvider.readAttributes(LinuxFileSystemProvider.java:99)
kak-lsp: log: at java.base/java.nio.file.Files.readAttributes(Files.java:1851)
kak-lsp: log: at java.base/java.util.zip.ZipFile$Source.get(ZipFile.java:1264)
kak-lsp: log: at java.base/java.util.zip.ZipFile$CleanableResource.(ZipFile.java:709)
kak-lsp: log: at java.base/java.util.zip.ZipFile.(ZipFile.java:243)
kak-lsp: log: at java.base/java.util.zip.ZipFile.(ZipFile.java:172)
kak-lsp: log: at java.base/java.util.jar.JarFile.(JarFile.java:347)
kak-lsp: log: at java.base/sun.net.www.protocol.jar.URLJarFile.(URLJarFile.java:103)
kak-lsp: log: at java.base/sun.net.www.protocol.jar.URLJarFile.getJarFile(URLJarFile.java:72)
kak-lsp: log: at java.base/sun.net.www.protocol.jar.JarFileFactory.getOrCreate(JarFileFactory.java:106)
kak-lsp: log: at java.base/sun.net.www.protocol.jar.JarURLConnection.connect(JarURLConnection.java:132)
kak-lsp: log: at java.base/sun.net.www.protocol.jar.JarURLConnection.getJarEntry(JarURLConnection.java:97)
kak-lsp: log: at org.javacs.kt.externalsources.KlsURI.extractToTemporaryFile(KlsURI.kt:104)
kak-lsp: log: at org.javacs.kt.externalsources.JarClassContentProvider.tryReadContentOf(JarClassContentProvider.kt:60)
kak-lsp: log: at org.javacs.kt.externalsources.JarClassContentProvider.contentOf(JarClassContentProvider.kt:42)
kak-lsp: log: at org.javacs.kt.definition.GoToDefinitionKt.goToDefinition(GoToDefinition.kt:48)
kak-lsp: log: at org.javacs.kt.KotlinTextDocumentService$definition$1.invoke(KotlinTextDocumentService.kt:129)
kak-lsp: log: at org.javacs.kt.KotlinTextDocumentService$definition$1.invoke(KotlinTextDocumentService.kt:124)
kak-lsp: log: at org.javacs.kt.util.AsyncExecutor.compute$lambda-2(AsyncExecutor.kt:19)
kak-lsp: log: at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768)
kak-lsp: log: ... 3 more
kak-lsp: kotlin language server error: 'Internal error.'
```

Focusing on the specific crash:

```
kak-lsp: log: async2 Internal error: java.nio.file.NoSuchFileException: /home/ltdk/.gradle/caches/modules-2/files-2.1/net.fabricmc/sponge-mixin/0.10.7 mixin.0.8.4/7a4ca9d54d9ae564dea0363d668036a8420ed9b8/sponge-mixin-0.10.7 mixin.0.8.4.jar
```

If you check out the file it's trying to access, you'll notice that the issue is it converting a plus sign to a space, which normally should only be done in query strings:

```diff
-.gradle/caches/modules-2/files-2.1/net.fabricmc/sponge-mixin/0.10.7 mixin.0.8.4/7a4ca9d54d9ae564dea0363d668036a8420ed9b8/sponge-mixin-0.10.7 mixin.0.8.4.jar
+.gradle/caches/modules-2/files-2.1/net.fabricmc/sponge-mixin/0.10.7+mixin.0.8.4/7a4ca9d54d9ae564dea0363d668036a8420ed9b8/sponge-mixin-0.10.7+mixin.0.8.4.jar
```

Not 100% sure what's happening here, but if you run `gradle build` by itself, it passes, meaning that the paths definitely are working in gradle internally.

Start at org.javacs.kt.externalsources.KlsURI.extractToTemporaryFile in KlsURI.kt:104 and follow JarClassContentProvider.kt:60. Reproduce go-to-definition with the linked Minecraft project and a jar whose name contains a plus sign; done means the jar is read successfully without NoSuchFileException or converting the plus to a space.

Written by the indexing model from the issue text.