Python bindings to QSSC AST/IR

[donjan]

Running qss-compiler 128c937

Currently handing off processing to a Python-based program requires writing/reading a text-based MLIR dump. This is clumsy, slow and involves additional parsing. Any parser needs to formally define QSSC-specific dialects.

In the ideal case, the AST/IR tree could be walked from a Python program.

Additional info
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