Fix go to definition when server returns LocationLink

[FalsePattern]

Purpose

"Go to definition" completely breaks down when using LSP4IntelliJ for connecting to the Zig Language Server.
The source of this issue was that ZLS returns a LocationLink instead of a Location in the reply to the definition call, and this causes lsp4intellij to "spazz out", and open dozens of unrelated editors.

Goals

Implement a basic way for interpreting LocationLink without affecting too much of the codebase.

Approach

LocationLink contains all of the information necessary to construct a Location object, so I just added a trivial conversion to the EditorEventManager.requestDefinition method.

User stories

I have personally experienced this problem while developing a Zig language plugin for intellij using this library.
Once the fix was implemented in a local fork, go to definition started working normally again.

Release note

Added basic compatibility with LocationLink responses for definition lookups.

[CLAassistant]

All committers have signed the CLA.