Added support for additional_data and request_id fields in the APIResponseError class

[tsinglinrain]

This PR adds two missing updates from the 2025-09-03 version:
additional_data , makenotion/notion-sdk-js#603
request_id , makenotion/notion-sdk-js#618

In the current 2025-09-03 version, additional_data is always None.
According to the official upgrading guide, it will appear when calling the 2022-06-28 API version and the following conditions are met:

• The database includes multiple data sources
• Use database API
• The parameter passed is database_id

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.49%. Comparing base (7b467fe) to head (b74d698).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #293      +/-   ##
==========================================
- Coverage   99.50%   99.49%   -0.01%     
==========================================
  Files           7        7              
  Lines         401      395       -6     
==========================================
- Hits          399      393       -6     
  Misses          2        2              

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[tsinglinrain]

I’ve noticed the slight coverage drop reported by the CI.
It appears to come from notion_client/helpers.py, which isn’t modified in this PR.
My changes are limited to the client.py and errors.py modules, so the coverage difference should be unrelated.

[ramnes]

Excellent, thanks!