Consider refactoring

[sobolevn]

We have almost completely re-invented how to get callable arguments by name, position, and type:

returns/returns/contrib/mypy/_typeops/transform_callable.py

Lines 63 to 97 in c243100

	def _applied_positional_args(
	self,
	applied_args: List[FuncArg],
	) -> List[FuncArg]:
	callee_args = list(filter(
	lambda name: name.name is None, # TODO: maybe use `kind` instead?
	applied_args,
	))
	new_function_args = []
	for ind, arg in enumerate(FuncArg.from_callable(self._case_function)):
	if arg.kind in self._positional_kinds and ind < len(callee_args):
	new_function_args.append(arg)
	return new_function_args
	def _applied_named_args(
	self,
	applied_args: List[FuncArg],
	) -> List[FuncArg]:
	callee_args = list(filter(
	lambda name: name.name is not None,
	applied_args,
	))
	new_function_args = []
	for arg in FuncArg.from_callable(self._case_function):
	has_named_arg_def = any(
	# Argument can either be used as a named argument
	# or passed to `**kwrgs` if it exists.
	arg.name == rdc.name or arg.kind == ARG_STAR2
	for rdc in callee_args
	)
	if callee_args and has_named_arg_def:
	new_function_args.append(arg)
	return new_function_args

But, mypy already has this:

https://github.com/python/mypy/blob/52702e588ad2b8702ad74888ea10df852af1f035/mypy/typeops.py#L289-L313

Maybe, we can reuse it?