Investigate support for go-to language server feature

[TrevCraw]

Refer to https://github.com/OpenLiberty/liberty-tools-intellij/issues/192 to understand the background on this.

• Determine and document expected behaviour for the go-to feature.
• Determine and document which language servers provide go-to feature support (at least liberty-lemminx and LSP4MP).
• Determine and document all scenarios where the go-to feature is intended to be supported by the language servers.
• Confirm all scenarios are working as expected. For scenarios that are not working, open issues to address.
• Each scenario should be covered by test automation. Add a new UI test to the existing LS UI test automation set for each scenario.