dialects: (scf/scf_for) Factor out print and parse methods for For-like operations

[compor]

This PR:

• Factors out print and parse methods for For-like operations (currently scf.for, riscv_scf.for and riscv_scf.rof.

[alexarice]

This is potentially an interesting target for assembly format. I don't think we have any support for region arguments in assembly_format/pyrdl yet

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.32%. Comparing base (977a09e) to head (c1bb8cc).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3662      +/-   ##
==========================================
- Coverage   91.33%   91.32%   -0.01%     
==========================================
  Files         467      467              
  Lines       58548    58514      -34     
  Branches     5647     5652       +5     
==========================================
- Hits        53472    53436      -36     
  Misses       3626     3626              
- Partials     1450     1452       +2     

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