Add validation of loader kwargs to dataset_load

[goeffthomas]

As discussed on #238: #238 (comment)

http://b/388077145

[neshdev]

nit: This can become tedious as the methods get more complex. Instead, we can use the inspect module to get the function signature. See https://docs.python.org/3/library/inspect.html#introspecting-callables-with-the-signature-object.

[goeffthomas]

Oh, very cool. When we do the next data loader, I'll make a point to refactor this then.

[neshdev]

LGTM. Feel free to refactor to use inspect module if you can or feel free to save it for next time.

[neshdev]

I guess the unittest works, but in our code base we use redirect_stdout when working with standard output in unit test.
https://docs.python.org/3/library/contextlib.html#contextlib.redirect_stdout

[goeffthomas]

Ah, I see. I found this example in the code base and based my implementation off of that:

kagglehub/tests/test_auth.py

Lines 57 to 67 in 4fe7fd0

	def test_login_returns_403_for_bad_credentials(self) -> None:
	output_stream = io.StringIO()
	handler = logging.StreamHandler(output_stream)
	logger.addHandler(handler)
	login("invalid", "invalid")
	captured_output = output_stream.getvalue()
	self.assertEqual(
	captured_output,
	"Invalid Kaggle credentials. You can check your credentials on the [Kaggle settings page](https://www.kaggle.com/settings/account).\n",
	)

So something like this would be a better pattern to follow?:

kagglehub/tests/test_logger.py

Lines 45 to 55 in 4fe7fd0

	def test_kagglehub_console_filter_discards_logrecord(self) -> None:
	with TemporaryDirectory() as f:
	log_path = Path(f) / "test-log"
	logger = logging.getLogger("kagglehub")
	stream = StringIO()
	with redirect_stdout(stream):
	# reconfigure logger, otherwise streamhandler doesnt use the modified stderr
	_configure_logger(log_path)
	logger.info("HIDE", extra={**EXTRA_CONSOLE_BLOCK})
	logger.info("SHOW")
	self.assertEqual(stream.getvalue(), "SHOW\n")

[goeffthomas]

@neshdev I'll merge this for now to keep things moving. LMK if I should address the logging unit test and I'm going to backburner the inspect module refactor for the next data loader.