Javadoc support for referencedLibraries?

If a non-maven/gradle library is added to referencedLibraries config (added by https://github.com/redhat-developer/vscode-java/pull/1196) - it is impossible to add the library's javadoc.

Environment

• Operating System: Tried OSX and Gentoo Linux.
• JDK version: 19
• Visual Studio Code version: 1.76.0
• Java extension version: v0.25.8

Steps To Reproduce

1. Download any library from maven, e.g. https://repo1.maven.org/maven2/com/pelzer/util/pelzer-util/1.9.0/pelzer-util-1.9.0.jar and https://repo1.maven.org/maven2/com/pelzer/util/pelzer-util/1.9.0/pelzer-util-1.9.0-javadoc.jar
2. Delete META-INF/maven from the jar
3. Add two jars as referenced libraries to settings.json
4. Import a class and hover over it or ctrl+click on it. Only bare decompiler structure shows up without documentation.

Current Result

Import a class and hover over it or ctrl+click on it. Only bare decompiler structure shows up without documentation.

Expected Result

Ability to map javadoc jars to libraries to allow for javadoc presentation on hover.

Start with the referencedLibraries configuration and reproduce the missing documentation by importing a class and using hover or Ctrl+click after removing META-INF/maven. Done means users can map a Javadoc JAR to a referenced library and see its documentation on hover.