[QI2-1122] Added compiler_config for compilation stages

[NischalQuTech]

No description provided.

[oschusler]

The schemas are automatically generated from the pydantic models in the platform. Arguably, we should describe the format in the markdown files. They are a bit more readable, and not auto-generated.

That being said, am I right in understanding that this would translate to something like:

[
    {
        "compiler_stage": "mapped",
        "compiler_passes": [
            {
                "decomposer": "MckayDecomposer",
                "merge_single_qubit_gates": true
            }
        ]
    }
]

[Mythir]

I'm a bit hesitant to divide the compiler passes up into stages right now. Why not just a flat list of passes? Especially since we know that the current categorization doesn't make sense for QI (scheduled is not a part of OpenSquirrel, and routing is missing).

[Mythir]

Also, doesn't this schema enforce that every pass is a decomposer? Why not something a bit more generic like:

{
    "compiler_passes": [ 
        { 
            "name": "MckayDecomposer", 
            "arguments": {
                "merge_single_qubit_gates": true 
            }
        } ]
 }