Support converting objects to dicts

[jacobtomlinson]

Libraries like kubernetes, kubernetes_asyncio and lightkube have a to_dict() method on their objects. We use this to convert to kr8s objects already. We should probably support this same API in case other libraries want to convert kr8s objects to dicts.

from kr8s.objects import Pod

pod = Pod(...)

spec = pod.to_dict()
# is equivalent to the kr8s specific `spec = pod.raw`

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ef96441) 94.76% compared to head (7bf7973) 94.55%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #226      +/-   ##
==========================================
- Coverage   94.76%   94.55%   -0.22%     
==========================================
  Files          27       27              
  Lines        2638     2645       +7     
==========================================
+ Hits         2500     2501       +1     
- Misses        138      144       +6     

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