APIs for combining file-based and dict-based configs

[wyli]

Is your feature request related to a problem? Please describe.

the current API is private

MONAI/monai/bundle/scripts.py

Lines 68 to 71 in e18097d

	def _update_args(args: str | dict | None = None, ignore_none: bool = True, **kwargs: Any) -> dict:
	"""
	Update the `args` with the input `kwargs`.
	For dict data, recursively update the content based on the keys.

should be made available properly for reading multiple config files and dictionary-based overrides.