fix: resolve get_normalized_dict() returning empty for V3 endpoints

[brandonhawi]

Summary

Fixes #602

This PR resolves the issue where get_normailized* methods return empty values.

Notebook Demonstrating Fix

Root Cause:

• The normalization logic in NBAStatsResponse.get_normalized_dict() only checked for legacy format keys
• V3 endpoints don't have these keys - they require custom parsers to extract data
• When neither resultSets nor resultSet was found, the method returned an empty dictionary
• This made normalized methods unusable for all V3 endpoints

Solution

Added V3 endpoint support to the normalization pipeline in src/nba_api/stats/library/http.py:

1. Endpoint tracking: Store the endpoint name in NBAStatsResponse._endpoint when get_data_sets() is called, providing
   context for normalization
2. V3 normalization logic: Extended get_normalized_dict() to detect V3 endpoints and:

• Import and use the appropriate custom parser via get_parser_for_endpoint()
• Extract data sets from the parsed response
• Convert parsed V3 data into the same normalized format as legacy endpoints (list of dictionaries with header-mapped
  keys)
• Gracefully fall back to empty dict if parser isn't found

3. Backward compatibility: Legacy endpoints continue to work exactly as before - the V3 logic only activates when an
   endpoint is stored

Testing

Created new unit tests and all existing tests pass.

[swar]

What's the intention behind self._endpoint?

[brandonhawi]

self._endpoint stores the endpoint name from get_data_sets(endpoint="...") so that get_normalized_dict() knows which V3 parser to use.

Without it, get_normalized_dict() only has access to the raw response data (via self.get_dict()), which doesn't contain the endpoint name needed to select the correct parser.

Set to None by default, so legacy endpoints continue working unchanged.

[swar]

Overall this code seems fine. We'll just want test it out and ensure it's working. I do have a comment in the code as I'm trying to understand the need for adding _endpoint in the instantiation

[brandonhawi]

Tests are included in the PR. Happy to add more if you have specific scenarios in mind!

[swar]

Hey Brandon - I am going to keep this open until the next release. I want to run through some tests before I actually merge this in.