Metahandler Union added

[eduardo-imadeira]

added the metahandler Union to support for example:

var: Union[Annotated[int, IntRange(0,10)], Annotated[int, IntRange(20, 30)]]

so the variable can hold integers within the range of 0 to 10 or within the range of 20 to 30.

[alcides]

The tests are not passing on GA, nor in my machine (they get stuck on the fifth test in ind_gen_test).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.96%. Comparing base (76ac84f) to head (ab843e5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #184      +/-   ##
==========================================
+ Coverage   85.88%   85.96%   +0.08%     
==========================================
  Files          83       83              
  Lines        4201     4226      +25     
==========================================
+ Hits         3608     3633      +25     
  Misses        593      593              

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