Add more gate definitions for sdk integration

[TheGupta2012]

Summary of changes

This pull request includes several changes to the pyqasm/maps.py file, mainly focusing on adding new gate implementations and updating existing ones.

New Gate Implementations:

• Added the iswap_gate function to implement the iSwap gate as a decomposition of other gates.
• Added the cu_gate function to implement the CU gate, and updated the cu3_gate function to use u3_gate for decomposition.
• Added the cu1_gate function to implement the CU1 gate as a decomposition of other gates.
• Added the cphaseshift_gate function to implement the controlled phase shift gate using u3_gate for decomposition.

Removed/Updated Gate Implementations:

• Removed the xx_gate function and replaced its usage with rxx_gate in the gate map. [1] [2]
• Updated the cu3_gate function to use u3_gate instead of phaseshift_gate for decomposition.

Test Updates:

• Added _check_iswap_gate_op function to test the iswap_gate implementation.
• Updated the check_two_qubit_gate_op function to include the iswap gate.
• Migrated tests from tests.passes.test_qasm3_format.py

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 35.29412% with 22 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pyqasm/maps.py	35.29%	22 Missing ⚠️

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