feat: added silent_mode feature

[petruki]

This pull request introduces a robust "silent mode" feature to the Switcher client, allowing the client to gracefully handle remote API failures by temporarily switching to local snapshot evaluation and retrying remote calls after a configurable interval. The implementation includes new retry logic, enhancements to context and authentication handling, and comprehensive tests for the silent mode and date utilities.

Silent mode and retry logic:

• Added silent mode support to ContextOptions and integrated it into client initialization, enabling automatic fallback to local evaluation and retrying remote API calls after a specified interval. (switcher_client/client.py, switcher_client/lib/globals/global_context.py, [1] [2]
• Implemented retry configuration via the new RetryOptions class and integrated silent mode retry logic in RemoteAuth, including token expiration and renewal handling. (switcher_client/lib/globals/global_retry.py, switcher_client/lib/remote_auth.py, [1] [2] [3] [4]
• Enhanced remote API health checking and fallback logic, ensuring that the client attempts to re-authenticate and resume remote operations when the API becomes available again. (switcher_client/lib/remote.py, switcher_client/lib/remote.pyR32-R38)

Utility and error handling improvements:

• Introduced the DateMoment utility class for flexible date/time manipulation, used for calculating retry intervals in silent mode. (switcher_client/lib/utils/date_moment.py, switcher_client/lib/utils/date_moment.pyR1-R26)
• Improved error handling in the Switcher evaluation flow to trigger silent mode and local snapshot fallback on remote errors. (switcher_client/switcher.py, switcher_client/switcher.pyR40-R51)

Testing and documentation:

• Added comprehensive tests for silent mode behavior and retry logic, as well as unit tests for the DateMoment utility. (tests/test_switcher_silent_mode.py, tests/utils/test_date_moment.py, [1] [2]
• Updated documentation to clarify silent mode configuration and removed obsolete TODO comments. (README.md, README.mdL135-R135)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

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