Hookup Completions with Monaco Editor

[rebornix]

The completions items from the language service are now returned back to the editor.

[codecov]

Codecov Report

Merging #1460 into feat/monaco-service will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@                   Coverage Diff                   @@
##           feat/monaco-service    #1460      +/-   ##
=======================================================
- Coverage                57.87%   57.82%   -0.06%     
=======================================================
  Files                       63       63              
  Lines                     3091     3094       +3     
  Branches                   819      820       +1     
=======================================================
  Hits                      1789     1789              
- Misses                    1256     1259       +3     
  Partials                    46       46              

Impacted Files	Coverage Δ
packages/monaco-graphql/src/graphql.worker.ts	0.00% <0.00%> (ø)

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[acao]

already in the new PR! #1459