Added vergen-lib workflow

[CraZySacX]

• Added vergen-lib.yml workflow
• Renamed main.yml to vergen.yml
• Tweaked vergen-pretty.yml to depend on both vergen and vergen-lib workflow completion.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.05%. Comparing base (31ab292) to head (5370ca2).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #325 +/- ## ========================================== - Coverage 99.34% 99.05% -0.30% ========================================== Files 16 10 -6 Lines 2903 2212 -691 ========================================== - Hits 2884 2191 -693 - Misses 19 21 +2 ```

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