support reset and measure in qasmparser

[dlyongemallo]

Fixes #192 and #345.

[Copilot]

Pull request overview

This PR adds support for reset and measure instructions in the OpenQASM parser, addressing issues #192 and #345. The implementation introduces a new Reset gate class and extends the parser to handle both single-qubit and register-broadcast forms of these instructions.

Changes:

• Added Reset gate class that models reset as post-selection followed by state preparation in ZX-diagrams
• Extended QASM parser to handle reset instruction for single qubits and entire registers
• Enhanced measure instruction to support register broadcast syntax (measure q -> c)
• Added classical register tracking and automatic declaration in QASM output
• Implemented graph conversion logic to handle reset as effect + state vertices

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pyzx/circuit/gates.py	Added Reset gate class with to_qasm, reposition, and equality methods; added to_qasm method for Measurement
pyzx/circuit/qasmparser.py	Added parsing for reset and register-broadcast measure; added cregisters tracking
pyzx/circuit/graphparser.py	Added circuit_to_graph logic for Reset (effect+state vertices); added graph_to_circuit detection of Reset vs InitAncilla
pyzx/circuit/init.py	Added automatic classical register declaration inference from Measurement gates
tests/test_qasm.py	Added comprehensive tests for reset and measure including QASM round-trips and graph conversions
tests/test_init_postselect.py	Added unit tests for Reset gate functionality

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