bugfix numeric angles need to be specified as RotationAngle objects too

[vishal-ph]

Description

• Some fixed angles for the gates in GateMap decomposition are specified directly as numeric values. This breaks the code when these GateMap objects use any decomposition other than trivial. This can be quickly rectified by wrapping these numeric angles inside a RotationAngle object. This PR implements this fix

Checklist

• I have performed a self-review of my code.
• My changes generate no new warnings
• I have added/updated tests to make sure bugfix/feature works.
• New and existing unit tests pass locally with my changes.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

[codecov]

Codecov Report

Merging #91 (235e72c) into dev (833e3ed) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##              dev      #91   +/-   ##
=======================================
  Coverage   89.48%   89.48%           
=======================================
  Files          63       63           
  Lines        8099     8099           
=======================================
  Hits         7247     7247           
  Misses        852      852           

Impacted Files	Coverage Δ
openqaoa/qaoa_parameters/gatemap.py	88.02% <0.00%> (ø)

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