[WIP] [g-sim 3] (g + P)-sim

[Qottmann]

Merged the approach from https://github.com/PennyLaneAI/qml/pull/1106 with the branching approach here. This has neater illustrations anyway 👍

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• GOALS — Why are we working on this now? Lie algebras in QC and simulation techniques like g-sim are a hot topic due to their relevance to barren plateaus. This is an extension of g-sim to a small number of non-DLA gates. It bears some intriguing theoretical features but, like g-sim itself, is of rather limited practical relevance.

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[Qottmann]

In the end I managed to combine both approaches into one, as they are effectlvely the same. The branching one is nice to understand the underlying transformations and the required maximum moment order. The g-sim in moment vector spaces approach is more practical and what one would do in the end, though I finally argue based on some scaling numbers that this approach is overall of limited practical utility and should be understood as a mere theoretical insight.