feat: completion logic (for implements & variables)

[acao]

in order to introduce new language features across language server and browser ecosystems, here we combine the autocomplete logic in codemirror-graphql and in the graphql-language-service-interface.

& and implements

• introduces feat: interfaces implementing interfaces for the LSP #1742 parsing and autocomplete logic for & syntax to codemirror-graphql and thus graphiql
• address several edge cases present in feat: interfaces implementing interfaces for the LSP #1742 at the LSP level
• implements logic now covers:
  • filtering out interface suggestions which are already in the implements & list
  • filtering out the interface suggestion for the name of the interface you're extending
  • show both schema interfaces and interfaces in the file
  • show interface name suggestions as you type
  • (these bugs were introduced because we decided to include interfaces which aren't part of schema yet, but are inline in the file, to avoid confusion)

completion for variables

• because we are combining autocomplete logic, the variables completion logic used by the LSP server was causing issues in GraphiQL
• to ameliorate this, we remove usage of parse for variable completion that I introduced because it was causing EOF errors. use token parser instead, like the rest of the getAutocompleteSuggestions library. then we are able to parse incomplete graphql operations and SDL
• only show variables when they are compatible with the argument
• show variable types (previously it was just name)
• show available variables before you start typing, including alongside enum or boolean completion options

cc: @yoshiakis

notes:

• yes, we are adding type to CompletionItem results, but for the language server side, it will be converted to a string or set to undefined by the time the server is issuing the response to the LSP client (since it transmits over IPC, streams or sockets)

[codecov]

Codecov Report

Merging #1747 (cd4ee22) into main (ed6c94c) will decrease coverage by 9.13%.
The diff coverage is 47.61%.

@@            Coverage Diff             @@
##             main    #1747      +/-   ##
==========================================
- Coverage   66.97%   57.83%   -9.14%     
==========================================
  Files          87       30      -57     
  Lines        4906     1537    -3369     
  Branches     1351      288    -1063     
==========================================
- Hits         3286      889    -2397     
+ Misses       1385      566     -819     
+ Partials      235       82     -153     

Impacted Files	Coverage Δ
...kages/graphql-language-service-parser/src/types.ts	100.00% <ø> (ø)
...ervice-interface/src/getAutocompleteSuggestions.ts	58.65% <45.00%> (-15.46%)	⬇️
packages/codemirror-graphql/src/hint.js	94.73% <100.00%> (-0.22%)	⬇️
...language-service-utils/src/getASTNodeAtPosition.ts	18.75% <0.00%> (-81.25%)	⬇️
...guage-service-interface/src/getHoverInformation.ts	3.06% <0.00%> (-77.65%)	⬇️
...ql-language-service-interface/src/getDefinition.ts	11.90% <0.00%> (-74.10%)	⬇️
...aphql-language-service-interface/src/getOutline.ts	11.11% <0.00%> (-62.48%)	⬇️
...guage-service-utils/src/validateWithCustomRules.ts	60.00% <0.00%> (-40.00%)	⬇️
...ckages/graphql-language-service-utils/src/Range.ts	35.71% <0.00%> (-38.58%)	⬇️
...ge-service-interface/src/GraphQLLanguageService.ts	9.56% <0.00%> (-38.41%)	⬇️
... and 64 more

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[acao]

@yoshiakis another huge series of improvements in the last commit!

the variables completion was using graphql parse which just broke the heck out of codemirror-graphql. despite being new functionality, the EOF parse bug kept happening for incomplete queries, so i replaced it with runOnlineParser

several other edge cases fixed, all summarized in the commit message

last step is to test it all thoroughly with the LSP server! seems to be working working great in codemirror-graphql, graphiql and monaco-graphql with manual testing