refactor: add resource clients base_url

[jooola]

This property will become powerful with the addition of the Resource Actions Client Mixin.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.57%. Comparing base (f933cc3) to head (d575521).
⚠️ Report is 45 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #542      +/-   ##
==========================================
+ Coverage   96.55%   96.57%   +0.01%     
==========================================
  Files          64       64              
  Lines        2928     2945      +17     
==========================================
+ Hits         2827     2844      +17     
  Misses        101      101              

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