Data API data model extension

[emanuel-schmid]

Changes proposed in this PR:

• Add optional List properties to DataTypeInfo class: key_reference and version_notes. They are necessary in order to cope with the soon to be updated data_type Json Schema.
• Add trailing '/' for various urls, that's more consistent with the servers' url definitions and allows for testing on localhost
• Use a regular expression for extracting host and port from url (also for testing on localhost)

This PR fixes #

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• Source branch up-to-date with target branch
• Documentation updated
• Tests updated
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[zeliest]

I tried to run the test, tutorials and some of my scripts using the API. Everything runs fine. version_notes is to specify what has been changed in each version then? what about key_reference?

[peanutfun]

No need to use a regex, there is a function to extract url components: urllib.parse.urlsplit

Suggested change

	urlpat = r"http(s?)://([^:/]+)(:\d+)?(/|$)"
	match = re.match(urlpat, url)
	if match:
	host = match.group(2)
	port = int(match.group(3)[1:]) if match.group(3) else 443 if match.group(1) else 80
	else:
	raise ValueError(f'URL not as expected, cannot figure out host and port from "{url}"')
	return host, port
	url_split = urlsplit(url)
	port = url_split.port
	if port is None:
	port = 443 if url_split.scheme == "https" else 80
	return url_split.netloc, port

[emanuel-schmid]

cool 😎