Implement methods and publication "jump to definition" and "references".
[x] Implement definition indexing for methods and publications (supporting ValidatedMethod and PublishComposite packages).
[x] Implement references indexing.
[x] We were treating some requests that should be treated as references one as definition, we need to correctly treat those.
[x] Wire everything on the definition/references request response.
[x] Fix conflict with the built-in typescript/javascript extension - right now the builtin extension is providing some definitions that are not helpful and ends up eating the references we should provide. https://github.com/microsoft/vscode-discussions/discussions/360
Implement methods and publication "jump to definition" and "references".
ValidatedMethodandPublishCompositepackages).