feat: add rule exclusion test support

[yash2006kr]

Summary

• add SDK support for the testFindingsRefinement endpoint via test_rule_exclusion
• expose secops rule-exclusion test in the CLI with JSON/file support for detection exclusion application and outcome filters
• document the SDK/CLI usage and update the API mapping table

Fixes #214

Testing

• python -m pytest tests\chronicle\test_client.py tests\cli\test_cli.py tests\chronicle\test_rule_exclusion.py tests\cli\test_rule_exclusion.py

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