Monaco Mode - Phase 1

[acao]

For the first phase, we will only support completion and maybe diagnostics. Summarized more completely in #1445

Note: I will be pulling all the LSP changes out of this PR and creating seperate PRs to introduce those, so that this PR will soon be ~20 new files, a few changes and thats it, ideally.

Everything that isn't complete is partially underway. The only issue now is that monaco can't find the AMD id of our custom language worker.

Outcomes

• introduces packages/monaco-graphql and examples/monaco-webpack
• Diagnostics (working), Completion Support (todo)
• Required baseline: schema loading, primitive config loading

Todo

• GraphQL Mode & contribution
• GraphQL Worker Manager
• GraphQL Worker - written but worker manager will not load it
• GraphQL Language features
  • completion - mode providers work, worker doesnt
  • Diagnostics - mode providers work, worker doesnt
• Create graphql-config loaders for browser config load by default
• programatically provide graphql-config ala Programatic graphql config #1272?
• handle schema loading/changing schema via monaco service

Scoped to only completion for now. Other features will be iterative

How to Develop/Test

1. check out this branch
2. from the root: yarn --force
3. from the root: (watcher) yarn tsc --watch (one time) yarn build-ts
4. in another terminal tab, from examples/monaco-graphql: yarn start

[codecov]

Codecov Report

Merging #1421 into master will decrease coverage by 1.10%.
The diff coverage is 20.45%.

@@            Coverage Diff             @@
##           master    #1421      +/-   ##
==========================================
- Coverage   58.98%   57.87%   -1.11%     
==========================================
  Files          60       63       +3     
  Lines        3023     3091      +68     
  Branches      806      819      +13     
==========================================
+ Hits         1783     1789       +6     
- Misses       1194     1256      +62     
  Partials       46       46              

Impacted Files	Coverage Δ
packages/graphiql/src/components/QueryHistory.tsx	69.23% <ø> (ø)
packages/graphiql/src/components/ResultViewer.tsx	73.80% <ø> (ø)
...hql-language-service-interface/src/GraphQLCache.ts	51.45% <0.00%> (ø)
...-language-service-interface/src/findGraphQLTags.ts	64.86% <ø> (ø)
...ql-language-service-interface/src/parseDocument.ts	87.50% <ø> (ø)
...hql-language-service-interface/src/stringToHash.ts	0.00% <ø> (ø)
...hql-language-service-parser/src/CharacterStream.ts	68.75% <ø> (ø)
...kages/graphql-language-service-parser/src/Rules.ts	63.04% <ø> (ø)
...raphql-language-service-parser/src/onlineParser.ts	82.20% <ø> (ø)
...ql-language-service-server/src/MessageProcessor.ts	57.40% <ø> (ø)
... and 12 more

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[acao]

closed for #1459