feat(portal): Add support for tlds and suins subnames

[Tzal3x]

We are currently supporting only a pattern of domains like this 0x123.walrus.sites.

This PR makes it possible to:

• Parse more complex domains: 0x123.localhost:8080, 0x123.walrus.co.uk
• Support suins subnames: subsubname.subname.suinsname.walrus.sites
• Includes some unit tests so that we can have more confidence on the function's results. Gradually we can extend our code coverage.

Connected issues:

• Closes https://github.com/MystenLabs/walrus-sites/issues/32
• Closes https://github.com/MystenLabs/walrus-sites/issues/26

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Name	Status	Preview	Comments	Updated (UTC)
walrus-site	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 24, 2024 7:27am

[Tzal3x]

I still need to check if the suins subnames work as expected. Converting this back to draft PR until then.