Initialize the project cache more selectively

[acao]

Massive optimization for multi-project users!

Warning: this changes the cache lifecycle a lot, especially after config change. Might need some fine tuning 😆
I should add lots of tests actually.

Changes

WorkspaceMessageProcessor._updateGraphQLConfig() becomes _loadAndCacheProjectConfig(projectName: string), which has grown up and become more discerning and instead of re-building all project config caches, we just load the project config it needs to handle that event, of course! What a poor design of mine before.

Because of this, the cache invalidation strategy on configuration and settings changes must change, and also allow project caches to lazily load as needed.

TODO:

• as part of this, we must get rid of this._isInitialized(), should be detected per-project. otherwise one project cache that had an error initializing (we perform parsing and load files, etc) will prevent all other projects from having a cache or language features.
• figure out what to do on MessageProcessor.handleDidChangeConfiguration - perhaps re-create the cache reset behaviour using a public method for WorkspaceMessageProcessor?
• will building the project cache lazily on editor open or save events (not workspace) make working with the language? perhaps we need to add per-project cache initialization to onChange as well. again, this fires only once per project config per server init or config file or settings change events.
• make package.json change events ignored more quickly via a quick parse-and-check for the top-level graphql namespace.
• on workspace file changes, gently update just the cache for that file (maybe seperate PR)

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[github-actions]

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[acao]

actually, I think i have to get rid of this.isInitialized() entirely!

[Foo-x]

This looks great and the TODO is very clear!

[acao]

@Foo-x getting back to it today!

[codecov]

Codecov Report

Base: 65.70% // Head: 69.15% // Increases project coverage by +3.44% 🎉

Coverage data is based on head (802434f) compared to base (2d91916).
Patch coverage: 23.84% of modified lines in pull request are covered.

❗ Current head 802434f differs from pull request most recent head b3b5f48. Consider uploading reports for the commit b3b5f48 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2608      +/-   ##
==========================================
+ Coverage   65.70%   69.15%   +3.44%     
==========================================
  Files          85       72      -13     
  Lines        5106     4295     -811     
  Branches     1631     1439     -192     
==========================================
- Hits         3355     2970     -385     
+ Misses       1747     1320     -427     
- Partials        4        5       +1     

Impacted Files	Coverage Δ
packages/codemirror-graphql/src/lint.ts	100.00% <ø> (ø)
packages/codemirror-graphql/src/results/mode.ts	47.05% <ø> (ø)
packages/codemirror-graphql/src/utils/hintList.ts	95.65% <ø> (ø)
...ckages/codemirror-graphql/src/utils/mode-indent.ts	0.00% <0.00%> (ø)
packages/codemirror-graphql/src/variables/mode.ts	79.48% <ø> (ø)
packages/graphiql-react/src/editor/whitespace.ts	100.00% <ø> (ø)
packages/graphiql-react/src/utility/debounce.ts	0.00% <0.00%> (ø)
packages/graphiql-react/src/editor/tabs.ts	5.66% <5.66%> (ø)
packages/codemirror-graphql/src/variables/lint.ts	47.61% <66.66%> (+0.63%)	⬆️
packages/codemirror-graphql/src/hint.ts	94.73% <100.00%> (ø)
... and 100 more

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[acao]

ok! now it's ready for review 🥳

now that we (re) initialize the project caches more selectively in this PR, i much feel better about multi-workspace support
we even ensure the project is cached on workspace changes, and on change, not just on did open or save

i also feel good about the config change events. we invalidate the init status so the project caches will lazily rebuild on one of many events