core: make all constr methods classmethods

[alexarice]

Makes every constr method (found with ripgrep def\ constr) a classmethod instead of a staticmethod. This is in preparation for adding a default constr method to Attribute in a future PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.25%. Comparing base (a345d2a) to head (c3d7a49).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3826   +/-   ##
=======================================
  Coverage   91.25%   91.25%           
=======================================
  Files         461      461           
  Lines       57627    57627           
  Branches     5567     5567           
=======================================
  Hits        52588    52588           
  Misses       3612     3612           
  Partials     1427     1427           

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[compor]

In similar vein as in #3821 I assume?

[alexarice]

Yes

[superlopuh]

Would it make sense to migrate AnyMemRefTypeConstr and AnyIntegerTypeConstr with this PR? Ideally to MemRefType.constr() and IntegerType.constr()

[alexarice]

My plan was to start chipping away at these after #3828

[superlopuh]

kk