dialects: (memref_stream) add memref_stream.generic

[superlopuh]

Note stacked PR

This PR introduces the memref_stream equivalent of the linalg generic operation. The main differences are that this one has an extra property bounds, which contains the bounds of the loop nest, and that the operands may be streams, in which case they'll be lowered to stream reads and writes instead of loads and stores.

[codecov]

Codecov Report

Attention: 37 lines in your changes are missing coverage. Please review.

Comparison is base (2f9cf6b) 89.39% compared to head (ca1b823) 89.32%.

Files	Patch %	Lines
xdsl/dialects/memref_stream.py	71.96%	20 Missing and 17 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2148      +/-   ##
==========================================
- Coverage   89.39%   89.32%   -0.07%     
==========================================
  Files         311      311              
  Lines       38137    38266     +129     
  Branches     5636     5660      +24     
==========================================
+ Hits        34091    34183      +92     
- Misses       3259     3279      +20     
- Partials      787      804      +17     

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