AutoQASM freeparameter usage with pulse instruction

[yitchen-tim]

Issue #, if available:
https://github.com/orgs/amazon-braket/projects/2/views/6?pane=issue&itemId=44479389

Description of changes:

• Register the pulse usage of free parameter in program.
• Enable binding value to free parameter for pulse instructions.

Testing done:
tox

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (77690e6) 100.00% compared to head (f7ea029) 100.00%.

Additional details and impacted files

@@                Coverage Diff                 @@
##           feature/autoqasm      #794   +/-   ##
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  Coverage            100.00%   100.00%           
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  Files                   166       166           
  Lines                  9878      9870    -8     
  Branches               2095      2092    -3     
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- Hits                   9878      9870    -8     

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[laurencap]

This might need to be replaced with the new _register_and_convert_parameters method of utils. I'm guessing it would only appear as a bug if a FreeParameter appeared in a pulse instruction first, and later was used in a conditional statement.

[yitchen-tim]

Conditional statements later in a program would not be affected by here. In conditional statement, variables are still converted by _register_and_convert_parameters in the compare operator. I added a unit test that the freeparameter for pulse is later used by a conditional statement. Here, we actually do want the variable to be freeparameter instead of FloatVar.