wip: refactor language service setup and usage #1271
Draft
+401
−176
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Opening this up b/c I ended up accidentally doing a refactor (lol) and don't want to forget to merge it
This sets up architecture that should (eventually) help with more direct testing in the language service itself. My primary goal here is for the majority of language server tests to be able to run against both the language service and language server where it makes sense.