dialects: (stablehlo) add stablehlo.after_all

[efferifick]

Adds stablehlo.after_all

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.89%. Comparing base (1e488d7) to head (51e0c6b).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3104   +/-   ##
=======================================
  Coverage   89.89%   89.89%           
=======================================
  Files         419      419           
  Lines       53017    53025    +8     
  Branches     8221     8222    +1     
=======================================
+ Hits        47660    47669    +9     
  Misses       4028     4028           
+ Partials     1329     1328    -1     

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