Fix token required check for api.tilebox.com

[snamber]

Potential fix for https://github.com/tilebox/tilebox-python/security/code-scanning/1

To fix the issue, the URL should be parsed using Python's urllib.parse module, and the hostname should be explicitly checked to ensure it matches api.tilebox.com. This approach avoids the pitfalls of substring checks and ensures that the URL's structure is properly validated.

Steps to implement the fix:

1. Import urlparse from urllib.parse.
2. Parse the URL using urlparse(url) to extract its hostname.
3. Replace the substring check "api.tilebox.com" in url with a hostname check parsed_url.hostname == "api.tilebox.com".

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[lukasbindreiter]

@snamber Hmm the AI wasn't very successful here:

urlparse(url) doesn't work very well for grpc urls, which also can contain no schema, e.g.

That's why we have our own parse_channel_info helper - which I updated now a bit to also be useful here.