🌐🦀 OpenQASM 3 Parser

openqasm3_parser provides a compiler front end for OpenQASM 3 language (OQ3).

In this document, this parser is referred to as openqasm3_parser.

Differences with the OpenQASM reference parser are

• The parser in openqasm3_parser is much more performant. A crude test with large source files showed parse time reduced by a factor of 80.
• openqasm3_parser performs semantic analysis.

For support from the community, please join the Qiskit Slack community. The channel #open-qasm might be a good place for questions on the development.

Closed bounties:

• $100 | Refactor lowering list of qubits (gate operands) in syntax_to_semantics.rs
  closed by: atomgardner
• $100 | Implement function from_designator in syntax_to_semantics.rs
  closed by: abhamra
• $100 | Reduce prefix expression with unary minus wrapping literal, to literal with negative value
  closed by: atomgardner