Add pool data from cardano node

[LadyChristina]

All Submissions:

• Have you followed the guidelines in our Contributing documentation?
• Have you verified that there aren't any other open Pull Requests for the same update/change?
• Does the Pull Request pass all tests?

Description

Added pool metadata for Cardano that has been fetched from a full node and combined it with metadata from Big Query, so that the clustering is as complete as possible (it was observed that there were some clusters missing from the previous data, but this should be fixed now).

Checklist

Update Mapping Support Information Submissions:

• For which ledger do you update the mapping information?
  • Cardano
• What mapping information do you update?
  • identifiers
  • addresses
  • clusters
  • legal links
• Did you update the tests (if needed)?

[LauraAntunes1]

Just a couple of comments but otherwise looks fine

[ZeeshanJan]

Suggestion: We can also check if homepage_lower has a space in it.
It will help filtering out most invalid values included in INVALID_EXACT

[ZeeshanJan]

Suggestion: Or may be, we can add another function to filter out invalid domain name before we match INVALID_EXACT:
Something on the lines:

def is_valid_url(url):
    parsed = urlparse(url)
    return parsed.scheme in ('http', 'https') and bool(parsed.netloc) and ' ' not in parsed.netloc

[LadyChristina]

Do you mean a trailing space or like a space in the middle? Because trailing spaces are handled on line 272 via strip(), and I'm not sure if spaces in the middle are a thing.

For the url validity it's a good idea but I was thinking we might want to allow for cases where they skip the prefix but are still valid pages, e.g. where the entry is mypage.com instead of https://mypage.com

[ZeeshanJan]

I meant the spaces in between, for example coming soon and in process will automatically become invalid. A domain name does not have a space in it.

Yes, we can extend on URL validity to check if a TLD is present without http/https protocol. However, it may remain a manual check in the beginning.

[ZeeshanJan]

Looks good to me.
Please see a few suggestions I have left.