is_valid_input allows inputs that don't match function signature type

[bruvduroiu]

As seen in this skipped pytest unit test, is_valid_input will consider {"timezone": None} a valid input for function signature (timezone: str) -> str

Origin of bug:

semantic-router/semantic_router/utils/function_call.py

Lines 104 to 108 in 666b361

	for name, type_str in zip(param_names, param_types):
	if name not in inputs:
	logger.error(f"Input {name} missing from query")
	return False
	return True

[arashaga]

I second this had to do a lot of troubleshooting to get to this. it does not handle signature extraction gracefully.