Add support to filter ``torrents/info`` by private flag

[rmartin16]

• https://github.com/qbittorrent/qBittorrent/pull/20833

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (527eee7) to head (21fbf1f). Report is 25 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #464 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 15 15 Lines 1937 1937 Branches 376 376 ========================================= Hits 1937 1937 ```

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