change to dialect generator

[glou-nes]

rebase #660 & #447. @mofeing I messed up #660 so I open a new PR.
Several modifications:

• renaming result_ to result
• apply the typing defining in args, for instance: result_layouts=nothing::Union{Attribute, Nothing} doesn't constraint result_layouts so change to : result_layouts::Union{Attribute, Nothing} =nothing
• create Julia enum for EnumAttr : using Attr parsing (MLIR doesn't expose methods in C to easily construct arbitrary attribute) and discriminant.
• typing Attribute and use Julia type for easy ones (Int, Float, Vector).
• more complex Attributes ("struct" layout) such as conv
• add an AbstractAttributes type

[codecov]

Codecov Report

Attention: Patch coverage is 22.44318% with 546 lines in your changes missing coverage. Please review.

Project coverage is 37.88%. Comparing base (b6ffc96) to head (ca6546b).
Report is 394 commits behind head on main.

Files with missing lines	Patch %	Lines
src/mlir/Dialects/Nvvm.jl	0.00%	141 Missing ⚠️
src/mlir/Dialects/VHLO.jl	0.00%	58 Missing ⚠️
src/mlir/IR/Attribute.jl	41.57%	52 Missing ⚠️
src/mlir/Dialects/StableHLO.jl	54.28%	48 Missing ⚠️
src/mlir/Dialects/TPU.jl	0.00%	46 Missing ⚠️
src/mlir/Dialects/Llvm.jl	4.76%	40 Missing ⚠️
src/mlir/Dialects/CHLO.jl	28.26%	33 Missing ⚠️
src/mlir/Dialects/Gpu.jl	0.00%	33 Missing ⚠️
src/mlir/Dialects/Triton.jl	0.00%	32 Missing ⚠️
src/mlir/Dialects/Arith.jl	0.00%	19 Missing ⚠️
... and 10 more

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #691       +/-   ##
===========================================
+ Coverage   21.66%   37.88%   +16.21%     
===========================================
  Files          46       75       +29     
  Lines        8048    15152     +7104     
===========================================
+ Hits         1744     5741     +3997     
- Misses       6304     9411     +3107     

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