feat: Monaco Mode - Phase 2 - Mode & Worker

[acao]

For the second phase, we will implement a monaco mode and worker, and we only support completion and maybe diagnostics. Summarized more completely in #1445

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
  • Diagnostics - mode providers work

Another PR?

• 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 #1459 into master will decrease coverage by 0.17%.
The diff coverage is 45.00%.

@@            Coverage Diff             @@
##           master    #1459      +/-   ##
==========================================
- Coverage   58.98%   58.80%   -0.18%     
==========================================
  Files          60       60              
  Lines        3023     3042      +19     
  Branches      796      811      +15     
==========================================
+ Hits         1783     1789       +6     
- Misses       1194     1207      +13     
  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 7 more

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[acao]

@rebornix gave you credit since you created most of the features! haha

[acao]

to preview the monaco branch, append the slash /monaco path:
https://deploy-preview-1459--graphiql-test.netlify.com/monaco/

[acao]

we can decide what this should be before we release a stable version, but I'll probably just change it to something like 0.1.0 for the first pre-release