Add base client call_method function and supporting code.

[MrCreosote]

Not worth the effort to set up an auth service etc. locally, just use a token.

Still to do:

• Dynamic service support
• Async job via callback server support

[codecov]

Codecov Report

❌ Patch coverage is 96.05263% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.15%. Comparing base (1f67aa4) to head (dc8ebc4).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/kbase/sdk_baseclient.py	96.05%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main       #2      +/-   ##
===========================================
- Coverage   100.00%   96.15%   -3.85%     
===========================================
  Files            1        1              
  Lines            2       78      +76     
===========================================
+ Hits             2       75      +73     
- Misses           0        3       +3     

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