Group Java settings by categories

[testforstephen]

What it does in this PR:

• Group the settings by categories, this can make it easier to navigate the settings through the settings UI. The category display order is based on the development E2E workflow.
  

• Adjust the display order for the settings instead of alphabetical order.

[rgrunber]

• Do you feel it's worth creating a category called References to contain java.implementationsCodeLens.enabled, java.inlayHints.parameterNames.enabled, java.inlayHints.parameterNames.exclusions, java.references.includeAccessors, java.references.includeDecompiledSources, java.referencesCodeLens.enabled, java.symbols.includeSourceMethodDeclarations ? Or did you want to reduce the number of categories and since very few are explicitly "reference" related, it made sense to leave them as Others for now ?
• Thoughts on putting java.edit.smartSemicolonDetection.enabled under "Code Generation" ?

Overall, I think this is nicely organized.

[testforstephen]

• Do you feel it's worth creating a category called References to contain java.implementationsCodeLens.enabled, java.inlayHints.parameterNames.enabled, java.inlayHints.parameterNames.exclusions, java.references.includeAccessors, java.references.includeDecompiledSources, java.referencesCodeLens.enabled, java.symbols.includeSourceMethodDeclarations ? Or did you want to reduce the number of categories and since very few are explicitly "reference" related, it made sense to leave them as Others for now ?

How about adding a new category Code Navigation instead of References?

• Thoughts on putting java.edit.smartSemicolonDetection.enabled under "Code Generation" ?

Sure, it's ok.

[testforstephen]

In the latest commit:

• Add new category "Code Navigation" with children settings such as
  • "java.referencesCodeLens.enabled"
  • "java.implementationsCodeLens.enabled"
  • "java.references.includeAccessors"
  • "java.references.includeDecompiledSources"
  • "java.symbols.includeSourceMethodDeclarations"
  • "java.typeHierarchy.lazyLoad"
  • "java.inlayHints.parameterNames.enabled"
  • "java.inlayHints.parameterNames.exclusions".
• Move "java.edit.smartSemicolonDetection.enabled" to "Code Generation"
• Move "java.signatureHelp.enabled" and "java.signatureHelp.description.enabled" to "Code Completion" since signature help is more related with code completion behavior.

[rgrunber]

I would be fine with merging this so feel free to do so whenever you're ready.