PYTHON-5395 - Add convert_decimal to CodecOptions #8034

Job	Run time
CPython 3.9-ubuntu-latest	11m 23s
CPython pypy-3.10-ubuntu-latest	12m 11s
CPython 3.13t-ubuntu-latest	11m 20s
Make an sdist	13s
static	3m 54s
Test using minimum dependencies and supported Python	40s
Test async's minimum dependencies and Python	42s
Typing Tests (3.11)	1m 11s
Docs Checks	41s
Link Check	2m 43s
Typing Tests (3.9)	1m 14s
DocTest	1m 8s
Install from SDist and Test	56s
	48m 16s

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