Symbol support for single document

[acao]

Originally based on
graphql/graphql-language-service#195

Works a charm with https://github.com/prisma-labs/vscode-graphql

HTD:

1. clone vscode-graphql, npm install
2. from graphiql/packages/graphql-language-service-server, yarn link
3. yarn build graphiql
4. open vscode-graphql in vscode, yarn link graphql-language-service-server and launch 'Extension' in debugger panel
5. An instance of vscode will open. open a directory containing a .graphqlconfig with a url (see server tests for an example file) and a .graphql file in the same directory. You'll see schema-driven completion, diagnostics, etc
6. Finally, test the new capabilities: ensure that you can peek object/input object/fragment/query argument definitions of any type, and that you can see an outline in vscode of at least the fragment and operation definitions.

TODO:

• handle document-wide symbol requests for operations
• add outline support for SDL/IDL/schema definition types
• handle document-wide symbol requests for schema types (thanks to above) (symbols are where the outline items get their icons for example. much more to come there!)
• show outlines in vscode!
• more tests for GLS interface symbol/outline support
• workspace-wide symbols (in another PR possibly?)
• handle references request (in another PR possibly?)

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@0f99f17). Click here to learn what that means.
The diff coverage is 69.56%.

@@            Coverage Diff            @@
##             master    #1244   +/-   ##
=========================================
  Coverage          ?   60.95%           
=========================================
  Files             ?       75           
  Lines             ?     3468           
  Branches          ?      670           
=========================================
  Hits              ?     2114           
  Misses            ?     1216           
  Partials          ?      138

Impacted Files	Coverage Δ
...aphql-language-service-interface/src/getOutline.ts	86.84% <ø> (ø)
...graphql-language-service-server/src/startServer.ts	0% <0%> (ø)
...ages/graphql-language-service-server/src/Logger.ts	21.73% <100%> (ø)
...raphql-language-service-server/src/GraphQLCache.ts	55.08% <100%> (ø)
...ql-language-service-server/src/MessageProcessor.ts	60.35% <63.15%> (ø)
...ge-service-interface/src/GraphQLLanguageService.ts	51.35% <85%> (ø)

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[acao]

seems there was an issue where the last amended push on publish didn't end up in master

[acao]

@divyenduz do you wanna give this a spin and let me know if im missing anything?

[acao]

I think we can do this in a seperate PR:
https://github.com/graphql/graphiql/pull/1244/files#diff-0094c9d6723c3042b174037952ce1078R191

[divyenduz]

I gave it a spin, looks good to me. I might not know it completely but fields (success) and arguments (title, content) look alike, is that expected?

Ah, more variations in icon are possible (wrench for deleteCount for example) but it is a good to have: https://code.visualstudio.com/docs/getstarted/userinterface#_outline-view

[acao]

ah yes, these icons are reflections of the symbol types!

the purpose here is that the purple icon is a field with arguments, as it acts as a method. in this case, title and content are arguments for the field createPost right? i wasnt sure how else to represent a field with arguments other than with a SymbolKind.Method and SymbolKind.Field for arguments?