Add status query parameter to Broadcasts + Broadcasts Stats

[n7studios]

Summary

Adds support for the status parameter on the get_broadcasts and get_broadcasts_stats methods, which was added to the API on May 26th 2026:
https://developers.kit.com/changelog#may-26-2026-%E2%80%94-broadcasts

Testing

• testGetBroadcastsWithCompletedStatus: Test that get_broadcasts() returns the expected data when the completed status is specified.
• testGetBroadcastsWithAbortedStatus: Test that get_broadcasts() returns the expected data when the aborted status is specified.
• testGetBroadcastsStatsWithCompletedStatus: Test that get_broadcasts_stats() returns the expected data when the completed status is specified.
• testGetBroadcastsStatsWithAbortedStatus: Test that get_broadcasts_stats() returns the expected data when the aborted status is specified.

Checklist

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• The code passes when running PHPStan
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)