Implement SSPI authentication #534

Job	Run time
test-postgres (9.5)	5m 9s
test-postgres (9.6)	4m 26s
test-platforms (3.8, ubuntu-latest, asyncio)	3m 41s
test-postgres (10)	3m 47s
test-platforms (3.8, ubuntu-latest, uvloop)	3m 28s
test-postgres (11)	4m 7s
test-platforms (3.8, macos-latest, asyncio)	2m 42s
test-platforms (3.8, macos-latest, uvloop)	2m 42s
test-postgres (12)	4m 41s
test-platforms (3.8, windows-latest, asyncio)	5m 6s
test-postgres (13)	5m 10s
test-platforms (3.9, ubuntu-latest, asyncio)	3m 25s
test-postgres (14)	3m 50s
test-platforms (3.9, ubuntu-latest, uvloop)	3m 29s
test-postgres (15)	4m 43s
test-postgres (16)	4m 49s
test-platforms (3.9, macos-latest, asyncio)	3m 34s
test-platforms (3.9, macos-latest, uvloop)	2m 57s
test-platforms (3.9, windows-latest, asyncio)	5m 29s
test-platforms (3.10, ubuntu-latest, asyncio)	3m 0s
test-platforms (3.10, ubuntu-latest, uvloop)	3m 4s
test-platforms (3.10, macos-latest, asyncio)	2m 42s
test-platforms (3.10, macos-latest, uvloop)	2m 45s
test-platforms (3.10, windows-latest, asyncio)	5m 54s
test-platforms (3.11, ubuntu-latest, asyncio)	2m 56s
test-platforms (3.11, ubuntu-latest, uvloop)	3m 15s
test-platforms (3.11, macos-latest, asyncio)	3m 37s
test-platforms (3.11, macos-latest, uvloop)	3m 2s
test-platforms (3.11, windows-latest, asyncio)	5m 7s
test-platforms (3.12, ubuntu-latest, asyncio)	3m 32s
test-platforms (3.12, macos-latest, asyncio)	3m 39s
test-platforms (3.12, windows-latest, asyncio)	5m 55s
Regression Tests	1s
	2h 5m 44s

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