Consolidate URI handler naming.

[kacpermuda]

After the implementation of AIP-60 we have multiple URI schemes defined in providers and some resources attached to them, f.e. uri handlers. In the code there are different names related to it and I'd like to consolidate the naming of an URI handler. It's a small detail, but might be confusing so I could change that in my free time if you think it can be helpful 😄

Current Names:

• handler (in providers manager or provider.yml)
• normalizer (when sanitizing Dataset URI)
• the functions themselves are so far called sanitize_uri()

Proposed Name: normalizer (normalize_uri()) as we expect the returned uri to be normalized

Solution:
Identify all instances of the current names in the codebase and replace them with the standardized name. Test to ensure all functionality remains intact after renaming.

Benefits:

• Improved code readability and maintainability.
• Reduced potential for bugs and confusion.

@uranusjr Let me know your thoughts.