Add support for signature help in java

[ghostbuster91]

Is your feature request related to a problem? Please describe.

When writing java it is often useful to recall information about the current function signature by invoking signatureHelp lsp request. For now this works only when called from within a scala file.

Describe the solution you'd like

Implement signatureHelp also for java files for both scala and java code.

Describe alternatives you've considered

Checking signature from the completions menu.

Additional context

No response

Search terms

java, signatureHelp