Simplify callable and generic callable validation to unify, fix bug related to assignment and validators

[timkpaine]

No description provided.

[github-actions]

Test Results

473 tests  +1   469 ✅ +1   40s ⏱️ -1s
  1 suites ±0     4 💤 ±0 
  1 files   ±0     0 ❌ ±0 

Results for commit f657e99. ± Comparison against base commit fcb1716.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

❌ Patch coverage is 94.93671% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.28%. Comparing base (cb9d44a) to head (56747e9).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
ccflow/callable.py	93.75%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #153      +/-   ##
==========================================
+ Coverage   95.09%   95.28%   +0.19%     
==========================================
  Files         130      130              
  Lines        7609     7620      +11     
  Branches      501      499       -2     
==========================================
+ Hits         7236     7261      +25     
+ Misses        248      243       -5     
+ Partials      125      116       -9     

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