Refactored retry config into `_retry.py` and added support for exponential backoff and `Retry-After` header#871

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jonathanedey wants to merge 4 commits intofcm-http2from

Commits on Apr 11, 2025

Refactored retry config to `_retry.py` and added support for backoff and Retry-After
jonathanedey
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Commits on Apr 14, 2025

Commits on May 14, 2025

Address review comments
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