Move from pybind11 to nanobind

[mknaranja]

Motivation / Current Behaviour

Enhancement description

By the developer from pybind11 (and nanobind), I was pointed / we were suggested to move to nanobind since it uses near-identical syntax and shows up to ~4× faster compile time, ~5× smaller binaries, and ~10× lower runtime overheads compared to pybind11.

More info: https://github.com/wjakob/nanobind

Additional context

No response

Checklist

• [x] Attached labels, especially loc:: or model:: labels.
• [x] Linked to project