qBraid SDK migration

[TheGupta2012]

Fixes #12
Fixes #50

Summary of changes

This PR is a WIP and part of a larger integration with qBraid-sdk. Commits and changes are done as and when new requirements are discovered when adding pyqasm to the sdk

• transpiler/conversions/qasm2/qasm2_to_cirq.py: Cirq expects qasm version strings as x.0 and string literals as ' instead of ". Thus, need to update that in module initialization
• tests/passes/test_qasm2_compat.py: Migrate to pyqasm/tests/qasm2/test_rotation_gates.py
• Change module structure according to [FEATURE] pyqasm.Module: loads, dumps, and in-place operations for improved UX #50
• passes/qasm/analyze.py::has_measurements: Migrate to QasmModule.has_measurements
• passes/qasm/compat.py::remove_measurements: Migrate as QasmModule.remove_measurements()
• Add remove_barriers() method to the QasmModule
• passes/qasm/analyse::depth: Replace with the QasmModule.depth() method. Since the visitor object was already doing the unrolling, calculation of depth was coupled with its analysis.
• Migrated depth tests from qbraid-sdk to pyqasm

Details of Tests migrated

1. remove_measurements : [1]
2. depth : [1] [2] [3] [4] [5]
3. To remove tests/passes/test_qasm2_compat.py by replacing with unroll

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 93.85113% with 19 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pyqasm/modules.py	91.89%	15 Missing ⚠️
pyqasm/elements.py	88.23%	4 Missing ⚠️

📢 Thoughts on this report? Let us know!

[TheGupta2012]

Closing this PR with current changes, have opened issues #53 - #57 for continuing work on the migration