core: Refactor irdl_op_definition

[math-fehr]

Refactor get_accessors_from_op_def out of irdl_op_definition, towards allowing us to define new Python classes with only an OpDef, rather than an irdl_op_definition

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.64%. Comparing base (c566b0d) to head (046fd0e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2575      +/-   ##
==========================================
- Coverage   89.64%   89.64%   -0.01%     
==========================================
  Files         357      357              
  Lines       45165    45169       +4     
  Branches     6790     6791       +1     
==========================================
+ Hits        40490    40492       +2     
- Misses       3655     3656       +1     
- Partials     1020     1021       +1     

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