PYTHON-5215 Add an asyncio.Protocol implementation for KMS #7954

Job	Run time
static	4m 4s
CPython 3.13t-ubuntu-latest	11m 22s
CPython 3.9-ubuntu-latest	11m 11s
CPython pypy-3.10-ubuntu-latest	12m 6s
Docs Checks	43s
Typing Tests (3.11)	1m 5s
Link Check	1m 39s
Test async's minimum dependencies and Python	48s
Make an sdist	17s
DocTest	1m 0s
Test using minimum dependencies and supported Python	44s
Typing Tests (3.9)	1m 10s
Install from SDist and Test	57s
	47m 6s

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