QASM import

[shinich1]

Is your feature request related to a problem? Please describe. N/A

Describe the feature you'd like Add a function or class to graphix.transpiler module, to generate a graphix.Pattern from a QASM-defined circuit, via graphix.transpiler.Circuit transpiler. We will need to limit its capability to what we can transpile into a pattern (let your new function/class throw exception if encountered operation not covered, but try to hack around as much as possible by e.g. decomposing gates.). See graphix.transpiler.Circuit transpiler class for what is currently allowed.

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