Add parametrize_circuit function

[garrison]

This function provides an alternative to generate_ansatz_from_circuit for the case in which the actual gates should be maintained, but values replaced with parameters.

• Separate unrelated functions into two files
• Add tests
• Add demo?
• Is this the best name? We could also consider renaming the existing generate_ansatz_from_circuit.
• Release note

[coveralls]

Pull Request Test Coverage Report for Build 13419930685

Details

• 1 of 17 (5.88%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-2.6%) to 95.497%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
qiskit_addon_aqc_tensor/ansatz_generation.py	1	17	5.88%

Files with Coverage Reduction	New Missed Lines	%
qiskit_addon_aqc_tensor/simulation/explicit_gradient.py	1	93.68%

Totals
Change from base Build 13144455771:	-2.6%
Covered Lines:	615
Relevant Lines:	644

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💛 - Coveralls