move vscode grammars, basic language support to standalone syntax extension

[acao]

vscode-graphql now depends on this extension, and provides language server support in addition. this allows alternative LSP servers and non-LSP graphql extensions to use our highlighting only, or allows users to just install the syntax highlighting extension if they don't need LSP server features.

[changeset-bot]

🦋 Changeset detected

Latest commit: 821c189

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
vscode-graphql	Minor
vscode-graphql-syntax	Patch

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[github-actions]

The latest changes of this PR are available as canary in npm (based on the declared changesets):

| Package | Version |
|------|---------|
yarn workspace  | graphiql/react
| > vscode-graphql | 0.7.0-canary-fd0bb656.0

[codecov]

Codecov Report

Merging #2573 (821c189) into main (2d91916) will increase coverage by 3.90%.
The diff coverage is 23.84%.

@@            Coverage Diff             @@
##             main    #2573      +/-   ##
==========================================
+ Coverage   65.70%   69.61%   +3.90%     
==========================================
  Files          85       72      -13     
  Lines        5106     4275     -831     
  Branches     1631     1436     -195     
==========================================
- Hits         3355     2976     -379     
+ Misses       1747     1294     -453     
- 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]

CC @captbaritone @orta this is the PR for creating the syntax only extension by the way!

I think I can finish setting this up today. i think we will use the namespace GraphQL.vscode-graphql-syntax because the naming convention then reflects that it is related to this project, so it might help users with navigation who have an issue with that extension vs yours or others. however GraphQL.syntax is very tempting haha

[acao]

Just thought that the @graphql/tsc might like to know this really exciting change happened today, as well as this related one for relay:

facebook/relay#4032