Support for is_type_definition relationship field for SymbolInformation

[hshukla-uber]

Currently scip-java only supports is_reference and is_implementation fields for relationships between symbols.
It would be nice if we can get support for is_type_definition defined in scip.proto here. This would help with go-to-typedef navigation in the editor

[keynmol]

Hello.

Currently we aren't working on new feature requests for scip-java, focusing mostly on bug fixes and customer issues.

Additionally, I don't believe "Go To Definition" exists in our product, and there are no SCIP indexers we maintain that support this feature either.

That said, we'll be happy to review a PR for it, though at this point I won't be much help in implementing it as I haven't looked into this issue at all.