Allow passing api kwarg to APIObject.list()

[jacobtomlinson]

Allow passing api kwarg to APIObject.list() in the same way you can to APIObject.get().

import kr8s

api = kr8s.api()
pods = kr8s.objects.Pod.list(api=api)

Closes #560

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.13%. Comparing base (87063fc) to head (df8b3ca).
Report is 169 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #562      +/-   ##
==========================================
- Coverage   94.61%   94.13%   -0.49%     
==========================================
  Files          29       30       +1     
  Lines        3141     4192    +1051     
==========================================
+ Hits         2972     3946     +974     
- Misses        169      246      +77     

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