dialects: (stablehlo) add stablehlo.token

[efferifick]

Adds stablehlo.token type.

[efferifick]

I am not sure if stablehlo.token should be parametrized attribute. All TypeAttributes must be either ParametrizedAttribute or Data so I just picked one. Let me know if I should remove this restriction from TypeAttribute or if stablehlo.token is fine as ParametrizedAttribute.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.89%. Comparing base (b55fadc) to head (9c290de).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3093      +/-   ##
==========================================
- Coverage   89.89%   89.89%   -0.01%     
==========================================
  Files         417      417              
  Lines       52945    52948       +3     
  Branches     8214     8215       +1     
==========================================
+ Hits        47594    47595       +1     
- Misses       4022     4023       +1     
- Partials     1329     1330       +1     

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[superlopuh]

This is perfect, you did the right thing!