Allow auto-library-completion to seed libraries

[alongd]

The auto-library-completion feature in #160 did not allow to seed libraries.
Now this option was added, and seed libraries can be determined by flagging the seed key in the data/libraries.yml file
A test was added

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.

Project coverage is 47.55%. Comparing base (2d7c1ca) to head (482fbba).

Files with missing lines	Patch %	Lines
t3/main.py	57.14%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #161      +/-   ##
==========================================
+ Coverage   47.54%   47.55%   +0.01%     
==========================================
  Files          25       25              
  Lines        3458     3463       +5     
  Branches      934      936       +2     
==========================================
+ Hits         1644     1647       +3     
- Misses       1606     1607       +1     
- Partials      208      209       +1     

Flag	Coverage Δ
unittests	47.55% <57.14%> (+0.01%)	⬆️

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