dialects: (cf) add switch

[alexarice]

Adds cf.switch and simple test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.02%. Comparing base (c4bcca3) to head (dc30d43).
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3156      +/-   ##
==========================================
+ Coverage   90.00%   90.02%   +0.01%     
==========================================
  Files         427      430       +3     
  Lines       53857    54119     +262     
  Branches     8344     8378      +34     
==========================================
+ Hits        48474    48720     +246     
- Misses       4036     4043       +7     
- Partials     1347     1356       +9     

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[alexarice]

Apparently mlir uses properties when it says it's using attributes and so I've switched this over and am rerequesting review

[superlopuh]

Yeah I've found this really confusing, I think it's because no-one's responsible for finishing the properties transition, and because attributes can be put in properties...