migrate graphiql-explorer into the repo, ts conversion

[acao]

• manually converted from flow, down to ~4 errors with strict: false, and with strict: true it is about ~51
• disable, eslint and spellcheck for these files temporarily to test the integration
• adopting from the original repo https://github.com/OneGraph/graphiql-explorer as per previous discussions with onegraph
• resolve graphiql-explorer locally for the plugin build
• split into multiple files for maintainability

to preview, see:

https://deploy-preview-3374--graphiql-test.netlify.app/webpack

also provides a typedoc

CC

@dwwoelfel and/or @sgrove , how would you like to go about this? Attribution in the readme and whatever license you chose? Or should we publish it as @graphiql/explorer under a seperate NPM module?

BCC @sachag

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[codecov[bot]]

Codecov Report

Merging #3374 (2340812) into main (2348641) will increase coverage by 0.07%. Report is 19 commits behind head on main. The diff coverage is 78.04%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3374      +/-   ##
==========================================
+ Coverage   55.75%   55.82%   +0.07%     
==========================================
  Files         110      110              
  Lines        5243     5261      +18     
  Branches     1426     1434       +8     
==========================================
+ Hits         2923     2937      +14     
- Misses       1897     1900       +3     
- Partials      423      424       +1     

Files	Coverage Δ
...raphql-language-service-server/src/GraphQLCache.ts	50.88% <50.00%> (ø)
...ql-language-service-server/src/MessageProcessor.ts	46.11% <50.00%> (-0.11%)	:arrow_down:
...nguage-service/src/utils/getVariablesJSONSchema.ts	94.59% <98.38%> (+0.71%)	:arrow_up:
packages/graphiql-react/src/editor/hooks.ts	38.16% <6.25%> (-0.42%)	:arrow_down:

[rubendinho]

Hi @acao is anything blocking this / any way to help get this merged in?