Partial Semantic Mode Meta-Issue

[DanielRosenwasser]

See #37713 as a pre-requisite for this issue!

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#38561 implements the core idea proposed in #37713.

Beyond that, there is still a set of UX issues that we should probably address:

• make cross-file go-to-definition work in the syntax-only server (#39037)
• make find-all-refs work on unresolved locals (#38836)
• better display experience for error types on the syntax server (#39032)
• expand when isNewIdentifierLocation on the syntax server (#39033)
• consider loose completions on the syntax server on unresolved/error types (#39034)

[DanielRosenwasser]

@sheetalkamat @amcasey @mjbvz @RyanCavanaugh @minestarks

[Jack-Works]

it should also support file navigation on a relative filename (import './file/x[cursor here]/y')