dialects: Add attributes and __init__ to gpu.FuncOp

[PapyChacal]

Add gpu.known_block_size and gpu.known_grid_size to gpu.func.
Add __init__ to gpu.FuncOp.

[codecov]

Codecov Report

Patch coverage: 81.81% and project coverage change: -0.01 ⚠️

Comparison is base (6c83a54) 89.63% compared to head (f9fa30d) 89.62%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1320      +/-   ##
==========================================
- Coverage   89.63%   89.62%   -0.01%     
==========================================
  Files         187      187              
  Lines       24576    24608      +32     
  Branches     3690     3699       +9     
==========================================
+ Hits        22028    22055      +27     
  Misses       1967     1967              
- Partials      581      586       +5     

Impacted Files	Coverage Δ
xdsl/dialects/gpu.py	97.36% <62.50%> (-1.41%)	⬇️
tests/dialects/test_gpu.py	100.00% <100.00%> (ø)
xdsl/parser/core.py	90.48% <100.00%> (ø)

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[tobiasgrosser]

Nice. This looks helpful.