PYTHON-5395 - Add convert_decimal to CodecOptions #8032

Job	Run time
DocTest	1m 5s
Docs Checks	40s
Typing Tests (3.11)	1m 10s
Link Check	6m 33s
static	4m 8s
Typing Tests (3.9)	1m 11s
Make an sdist	14s
CPython pypy-3.10-ubuntu-latest	12m 25s
CPython 3.9-ubuntu-latest	11m 26s
Test using minimum dependencies and supported Python	50s
Test async's minimum dependencies and Python	48s
CPython 3.13t-ubuntu-latest	11m 6s
Install from SDist and Test	55s
	52m 31s

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