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micropython: add __argspec__ to function objects

dx requested to merge dx/argspec into main

Returns a tuple that is somewhat compatible to inspect.FullArgSpec():

  • args: implemented
  • varargs: implemented (either None or "args")
  • varkw: implemented (either None or "kwargs")
  • defaults: not implemented, always None (not too difficult tbh)
  • kwonlyargs: implemented
  • kwonlydefaults: not implemented, always None
  • annotations: not implemented, always None

Inspired by mp_setup_code_state_helper() in bc.c which is the function that reads the prelude of the bytecode to prepare a function to be called, and also is the function that raises TypeError when you call it wrong.

MP_BC_PRELUDE_SIG_DECODE() and MP_BC_PRELUDE_SIZE_DECODE() are two macros that put a bunch of variables in your function, that's where all the n_*_args variables come from.

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