imp(types): add more luals type annotations

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 90.47619% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 94.4%. Comparing base (515166b) to head (3b09371). Report is 1 commits behind head on master.

Files	Patch %	Lines
lua/rsync/commands.lua	89.3%	8 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #125 +/- ## ======================================== + Coverage 94.2% 94.4% +0.1% ======================================== Files 5 6 +1 Lines 332 340 +8 ======================================== + Hits 313 321 +8 Misses 19 19 ```

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