PYTHON-5506 Prototype adaptive token bucket retry #8057

Job	Run time
static	4m 50s
CPython 3.9-ubuntu-latest	11m 18s
CPython pypy-3.10-ubuntu-latest	12m 18s
CPython 3.13t-ubuntu-latest	11m 11s
Typing Tests (3.11)	1m 14s
Typing Tests (3.9)	1m 9s
Test async's minimum dependencies and Python	46s
Docs Checks	40s
Link Check	2m 42s
DocTest	59s
Make an sdist	13s
Test using minimum dependencies and supported Python	41s
Install from SDist and Test	51s
Typing Tests (3.9)	1m 9s
CPython 3.13t-ubuntu-latest	11m 16s
Test async's minimum dependencies and Python	46s
static	4m 50s
CPython pypy-3.10-ubuntu-latest	12m 18s
Typing Tests (3.11)	1m 14s
Docs Checks	40s
Make an sdist	13s
DocTest	59s
Test using minimum dependencies and supported Python	41s
Install from SDist and Test	51s
Link Check	2m 42s
CPython 3.9-ubuntu-latest	11m 18s
	1h 37m 49s

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