[wip] gopls/internal/lsp/source/completion: func check allow command

[visualfc]

TODO: testdata

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.45%. Comparing base (8d8a3aa) to head (a13d387).

Additional details and impacted files

@@            Coverage Diff             @@
##           goplus     #242      +/-   ##
==========================================
- Coverage   46.64%   46.45%   -0.19%     
==========================================
  Files          12       12              
  Lines        1610     1610              
==========================================
- Hits          751      748       -3     
- Misses        782      784       +2     
- Partials       77       78       +1     

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