[jackpot] Declarative rules don't match lambdas

migrated issue from [NETBEANS-6025](https://issues.apache.org/jira/browse/NETBEANS-6025). Still reproducible in NB 15.

The first rule works. The second rule never captures anything, the third causes a class cast exception.

```java
$stream.mapToObj($lambda) :: $stream instanceof java.util.stream.IntStream =>
$stream.boxed()
;;

$stream.mapToObj($x -> $x) :: $stream instanceof java.util.stream.IntStream =>
$stream.boxed()
;;

$stream.mapToObj(($x) -> $x) :: $stream instanceof java.util.stream.IntStream =>
$stream.boxed()
;;
```

```java
// test snippet:
IntStream.of(1,2,3).mapToObj(x -> x);
```

exception of third rule:

```
java.lang.ClassCastException: class org.netbeans.modules.java.hints.spiimpl.JackpotTrees$VariableDeclWildcard cannot be cast to class com.sun.tools.javac.tree.JCTree$JCIdent (org.netbeans.modules.java.hints.spiimpl.JackpotTrees$VariableDeclWildcard is in unnamed module of loader org.netbeans.StandardModule$OneModuleClassLoader @24b6d0a8; com.sun.tools.javac.tree.JCTree$JCIdent is in unnamed module of loader org.netbeans.StandardModule$OneModuleClassLoader @68b9c85e)
at com.sun.tools.javac.tree.TreeCopier.visitIdentifier(TreeCopier.java:244)
at com.sun.tools.javac.tree.TreeCopier.visitIdentifier(TreeCopier.java:44)
at org.netbeans.modules.java.hints.spiimpl.JackpotTrees$VariableDeclWildcard.accept(JackpotTrees.java:80)
at com.sun.tools.javac.tree.TreeCopier.copy(TreeCopier.java:60)
at com.sun.tools.javac.tree.TreeCopier.copy(TreeCopier.java:72)
at com.sun.tools.javac.tree.TreeCopier.visitBlock(TreeCopier.java:135)
at com.sun.tools.javac.tree.TreeCopier.visitBlock(TreeCopier.java:44)
at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1094)
at com.sun.tools.javac.tree.TreeCopier.copy(TreeCopier.java:60)
at com.sun.tools.javac.tree.TreeCopier.copy(TreeCopier.java:53)
at com.sun.tools.javac.comp.DeferredAttr.attribSpeculative(DeferredAttr.java:479)
at com.sun.tools.javac.comp.DeferredAttr.attribSpeculative(DeferredAttr.java:467)
at com.sun.tools.javac.comp.DeferredAttr.attribSpeculativeLambda(DeferredAttr.java:442)
at com.sun.tools.javac.comp.ArgumentAttr.lambda$visitLambda$4(ArgumentAttr.java:301)
at com.sun.tools.javac.comp.ArgumentAttr.processArg(ArgumentAttr.java:242)
at com.sun.tools.javac.comp.ArgumentAttr.visitLambda(ArgumentAttr.java:299)
at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1976)
at com.sun.tools.javac.comp.ArgumentAttr.attribArg(ArgumentAttr.java:197)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:685)
at com.sun.tools.javac.comp.Attr.attribArgs(Attr.java:788)
at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:2584)
at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1799)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:687)
at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:733)
at org.netbeans.modules.java.hints.spiimpl.Utilities.attributeTree(Utilities.java:648)
at org.netbeans.modules.java.hints.spiimpl.Utilities.parseAndAttribute(Utilities.java:427)
at org.netbeans.modules.java.hints.spiimpl.Utilities.parseAndAttribute(Utilities.java:341)
at org.netbeans.modules.java.hints.spiimpl.Utilities.parseAndAttribute(Utilities.java:321)
at org.netbeans.modules.java.hints.spiimpl.Utilities.parseAndAttribute(Utilities.java:317)
at org.netbeans.modules.java.hints.spiimpl.pm.PatternCompiler.compile(PatternCompiler.java:44)
at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.doComputeHints(HintsInvoker.java:534)
at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHintsImpl(HintsInvoker.java:282)
at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:227)
at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:192)
at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:165)
at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:127)
at org.netbeans.modules.java.hints.spiimpl.hints.HintsTask.run(HintsTask.java:113)
at org.netbeans.modules.java.hints.spiimpl.hints.HintsTask.run(HintsTask.java:63)
[catch] at org.netbeans.modules.java.source.JavaSourceAccessor$CancelableTaskWrapper.run(JavaSourceAccessor.java:273)
at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:561)
at org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.run(TaskProcessor.java:786)
at org.openide.util.lookup.Lookups.executeWith(Lookups.java:279)
at org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.execute(TaskProcessor.java:702)
at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:663)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45)
at org.openide.util.lookup.Lookups.executeWith(Lookups.java:278)
at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)
```

Reproduce the three declarative rules with the provided IntStream snippet, then start at org.netbeans.modules.java.hints.spiimpl.pm.PatternCompiler.compile and inspect JackpotTrees.java, especially VariableDeclWildcard. Done means lambda forms are matched consistently and the parenthesized form no longer raises the reported ClassCastException.

Written by the indexing model from the issue text.