Require keywords for all resources

[cthoyt]

Support for keywords was added in #688 and additional manual curation was added in #699. A test for checking that all Bioregistry entries have keywords is also implemented, but disabled, in the following block:

bioregistry/tests/test_data.py

Lines 917 to 936 in be93f70

	@unittest.skip
	def test_keywords(self):
	"""Assert that all entries have keywords."""
	for resource in self.registry.values():
	if resource.is_deprecated():
	continue
	if not resource.contributor:
	continue
	if resource.get_mappings():
	continue # TODO remove this after first found of curation is done
	with self.subTest(prefix=resource.prefix, name=resource.get_name()):
	if resource.keywords:
	self.assertEqual(
	sorted(k.lower() for k in resource.keywords),
	resource.keywords,
	msg="manually curated keywords should be sorted and exclusively lowercase",
	)
	keywords = resource.get_keywords()
	self.assertIsNotNone(keywords)
	self.assertLess(0, len(keywords), msg=f"{resource.prefix} is missing keywords")

It would be great to go as far as requiring all manually added entries to the Bioregistry have keywords. Unfortunately, this is not part of all of the external data schemata and therefore can't be a global requirement, otherwise it would make import possible. So because of this, we can sporadically do keyword curation campaigns.

Alternatively, it might be interesting to try using LLMs to convert title + description of resources into keyword lists.