Review and update current Jobbergate's documentation

[fschuch]

What

• Migrated docstrings from sphinx to google style
• Renamed function garbage_collect to garbage_collector on the API, for clarification
• Fixed spelling errors in the docstrings

Why

Address feedback from acceptance testes

Task: https://jira.scania.com/browse/ASP-3778

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Peer Review

Please follow the upstream omnivector documentation concerning
peer-review guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.17%. Comparing base (e106ab9) to head (34206c0).
Report is 16 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #613   +/-   ##
=======================================
  Coverage   92.17%   92.17%           
=======================================
  Files          83       83           
  Lines        4423     4424    +1     
=======================================
+ Hits         4077     4078    +1     
  Misses        346      346           

Flag	Coverage Δ
agent	93.48% <ø> (ø)
api	95.09% <ø> (ø)
cli	87.70% <ø> (+<0.01%)	⬆️
core	96.32% <ø> (ø)

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