switch implementation for qasm3-qir

[TheGupta2012]

Fixes #80

Changes

• Added handler for switch case in openqasm according to the official reference.
• Also made some tweaks to the handling of array indexing
• Still a WIP , following tasks are left -
  • Handle type checking for target
  • Check for unsupported statements
  • Ensure expressions are const int expressions
  • Add more unit tests

[codecov]

Codecov Report

Attention: Patch coverage is 95.19231% with 5 lines in your changes missing coverage. Please review.

Files	Patch %	Lines
qbraid_qir/qasm3/visitor.py	95.14%	5 Missing ⚠️

📢 Thoughts on this report? Let us know!

[TheGupta2012]

Hi @ryanhill1 , the code coverage is tracking some lines which do not yet have active use.

I added the functionality for reqd_type in expression just for the IntType check in switch. I thought we should have the check for all types for any future updates. Since other constructs don't yet require this, we don't have examples to test against.