PYTHON-5215 Add an asyncio.Protocol implementation for KMS

[blink1073]

See benchmark gist.

Benchmark Results:

Before: 4.93s, 5.26s
After: 4.80s, 4.89s

Depends on mongodb-labs/drivers-evergreen-tools#679

[blink1073]

I'm debugging two failures:

test.asynchronous.test_connection_monitoring.AsyncTestCMAP.test_connection_monitoring_pool_clear_interrupting_pending_connections_clear_with_interruptInUseConnections___true_closes_pending_connections
test.asynchronous.test_connection_monitoring.AsyncTestCMAP.test_connection_monitoring_pool_create_min_size_error_error_during_minPoolSize_population_clears_pool

[blink1073]

I realized the benchmark test wasn't actually triggering the protocol -> I'm tweaking things locally

[blink1073]

This has a couple commits from #2467

[blink1073]

Okay this is ready for a look. We might consider switching to the base Protocol since the sizes of the responses are constrained and small, and we typically only have 2-3 reads per socket.

[blink1073]

I still need to make a PR for the fix to the kms mock server's 404 response.

[blink1073]

CSOT failure is unrelated: PYTHON-5492