Implement new scip SymbolInformation fields

[nicolas-guichard]

sourcegraph/scip/issues/154 added support for a number of new fields in SCIP's SymbolInformation:

• kind
• display_name
• signature_documentation
• enclosing_symbol (what was originally proposed as owner or parent in the linked issue)

On the Java side the sematicdb data already contains the kind (and properties, eg to build an AbstractMethod), but it does not on the Kotlin side.

For both Java and Kotlin:

• the semantidb data provides display_name
• the signature_documentation is already the first line of the documentation
• semanticdb does not specify the owner/enclosing_symbol for locals anymore, although there is already discussion about adding it back in Consider adding SymbolInformation.owner to the schema scalameta/scalameta#1540

[varungandhi-src]

We're not implementing new enhancement/feature requests at the moment. If you'd like to submit a PR, we can review PRs on a best-effort basis.