PYTHON-5395 - Add convert_decimal to CodecOptions #8035

Job	Run time
static	3m 44s
Docs Checks	39s
CPython 3.9-ubuntu-latest	11m 9s
DocTest	1m 9s
Typing Tests (3.9)	1m 5s
Link Check	2m 40s
Test using minimum dependencies and supported Python	40s
Make an sdist	15s
CPython pypy-3.10-ubuntu-latest	12m 16s
CPython 3.13t-ubuntu-latest	11m 19s
Typing Tests (3.11)	1m 8s
Test async's minimum dependencies and Python	44s
Install from SDist and Test	55s
	47m 43s

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