Switch to `nanobind`

[philip-paul-mueller]

In the DaCe Meeting at 2026-05-07 it was decided that the call interface shoudl translate to nanobind.
This should also be used to clean up the CompiledSDFG object.

Side Notes

• safe_call(): Turn it into a free function.
• Make it possible that CompiledSDFG can be constructed without having an SDFG.
• Keep old binary compatibility by still exporting the old symbols.
• Most argument processing should be done in C++ such that the argument processing in Python can be removed.