update completer for several functions

[GithubArray]

• $lookup: update to new syntax that support sub-pipeline
• $sortArray: new in v5.2+
• $toUUID: new in v8.0

[feliixx]

thanks !

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (d8ab481) to head (7c2b45c).
⚠️ Report is 31 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff            @@
##              dev   #181       +/-   ##
=========================================
- Coverage   76.15%      0   -76.16%     
=========================================
  Files          15      0       -15     
  Lines        1195      0     -1195     
=========================================
- Hits          910      0      -910     
+ Misses        251      0      -251     
+ Partials       34      0       -34     

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