transformations: (csl_stencil) Add bufferization pass

[n-io]

Change stencil.field to memrefs, change all tensors to memrefs, and perform a 'partial bufferization' by inserting bufferization.to_tensor and bufferization.to_memref ops where needed to that other dialects can still operate on tensors.

Todo:

• fix verification
• add docstrings
• review setting of restrict, writable, and read_only of the bufferization ops
• add extract_slice needed by linalg bufferize

Edit: I think I re-used a branch name of a merged branch, ignore some of the commits

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.85%. Comparing base (30446fe) to head (7619c61).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3004      +/-   ##
==========================================
+ Coverage   89.83%   89.85%   +0.02%     
==========================================
  Files         411      412       +1     
  Lines       51674    51816     +142     
  Branches     8034     8064      +30     
==========================================
+ Hits        46419    46557     +138     
+ Misses       3970     3968       -2     
- Partials     1285     1291       +6     

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[superlopuh]

Can you please assign yourself and add the appropriate labels?

[PapyChacal]

I'm not getting all semantics used so just reviewed the code itself!