PYTHON-5508 - Add built-in DecimalEncoder and DecimalDecoder #8039

Job	Run time
Link Check	5m 38s
Make an sdist	11s
CPython 3.9-ubuntu-latest	11m 22s
Typing Tests (3.9)	1m 10s
static	3m 6s
CPython 3.13t-ubuntu-latest	11m 28s
Typing Tests (3.11)	1m 11s
CPython pypy-3.10-ubuntu-latest	12m 4s
DocTest	1m 12s
Test async's minimum dependencies and Python	42s
Docs Checks	39s
Test using minimum dependencies and supported Python	40s
Install from SDist and Test	58s
	50m 21s

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