feat: add U and GPhase gates

[jcjaskula-aws]

Issue #, if available:
Adding the U and GPhase gates so customers can build circuits from OpenQASM3 and simulate them with the local simulator.
This allows to import "stdgates.inc".

Description of changes:
Created a U and GPhase class and adding them to the translator dict.

Testing done:
Adding a series of new tests.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f44ab58) 100.00% compared to head (b6e9563) 100.00%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##              main      #799    +/-   ##
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  Coverage   100.00%   100.00%            
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  Files          129       129            
  Lines         8398      8519   +121     
  Branches      1871      1905    +34     
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+ Hits          8398      8519   +121     

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[ajberdy]

Can we add defaults for this gate as we did with MS? That way we can users can define a u2 gate by only providing relevant params.

[ajberdy]

Might be tricky since only the first gate would have a default, so maybe we circle back to this in another pr

[ajberdy]

Maybe we just add documentation that setting angle_1 to pi/2 is equivalent to U2

[jcjaskula-aws]

Looks like u2/u3 are defined with a combination of gphase and U here. I like the idea to define u_i / update the docstring in another PR.

[speller26]

Looks good, just some nits