Warn on getting api-resources instead of failing

[jacobtomlinson]

This might close #230.

When we list resources we try and look up API resources in order to expand short names. However, if the API call to get the resource list fails we could still continue and just raise a warning instead of an exception.

This means when the API call fails you can't use short names to look up resources, but you can still use full names.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (4e87c09) 94.79% compared to head (95e5d49) 94.76%.

❗ Current head 95e5d49 differs from pull request most recent head eebb6ca. Consider uploading reports for the commit eebb6ca to get more accurate results

Files	Patch %	Lines
kr8s/_api.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #231      +/-   ##
==========================================
- Coverage   94.79%   94.76%   -0.03%     
==========================================
  Files          27       27              
  Lines        2669     2673       +4     
==========================================
+ Hits         2530     2533       +3     
- Misses        139      140       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.