dialects: (transform) Add structured match operation

[JonasCrols]

This PR adds the important operation of the structured match in the transform dialect.
The PR is opened as a draft as I have not been able to find out how to implement the interface-attribute. which should be of kind enum (https://mlir.llvm.org/docs/Dialects/Transform/#transformstructuredmatch-transformmatchop)
@superlopuh @jorendumoulin

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.88%. Comparing base (bd14181) to head (a04b7f3).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3079      +/-   ##
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- Coverage   89.90%   89.88%   -0.03%     
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  Files         418      418              
  Lines       52902    52944      +42     
  Branches     8202     8213      +11     
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+ Hits        47562    47588      +26     
- Misses       4014     4026      +12     
- Partials     1326     1330       +4     

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[jorendumoulin]

I'll have a look at the intenums!

[JonasCrols]

As discussed on zullip, we'll use IntegerAttr's instead of the proper Int32EnumAttributes. this means the PR is now ready for review