Implement SSPI authentication #539

Job	Run time
test-postgres (9.5)	3m 53s
test-platforms (3.8, ubuntu-latest, asyncio)	3m 11s
test-postgres (9.6)	4m 9s
test-platforms (3.8, ubuntu-latest, uvloop)	3m 10s
test-postgres (10)	3m 41s
test-platforms (3.8, macos-latest, asyncio)	6m 0s
test-postgres (11)	3m 42s
test-platforms (3.8, macos-latest, uvloop)	2m 37s
test-platforms (3.8, windows-latest, asyncio)	5m 1s
test-postgres (12)	3m 20s
test-platforms (3.9, ubuntu-latest, asyncio)	3m 7s
test-postgres (13)	3m 39s
test-platforms (3.9, ubuntu-latest, uvloop)	3m 8s
test-postgres (14)	3m 39s
test-platforms (3.9, macos-latest, asyncio)	2m 39s
test-postgres (15)	3m 30s
test-platforms (3.9, macos-latest, uvloop)	2m 39s
test-postgres (16)	3m 28s
test-platforms (3.9, windows-latest, asyncio)	5m 0s
test-platforms (3.10, ubuntu-latest, asyncio)	2m 52s
test-platforms (3.10, ubuntu-latest, uvloop)	3m 6s
test-platforms (3.10, macos-latest, asyncio)	2m 46s
test-platforms (3.10, macos-latest, uvloop)	2m 56s
test-platforms (3.10, windows-latest, asyncio)	5m 25s
test-platforms (3.11, ubuntu-latest, asyncio)	3m 6s
test-platforms (3.11, ubuntu-latest, uvloop)	3m 3s
test-platforms (3.11, macos-latest, asyncio)	2m 46s
test-platforms (3.11, macos-latest, uvloop)	3m 2s
test-platforms (3.11, windows-latest, asyncio)	5m 37s
test-platforms (3.12, ubuntu-latest, asyncio)	3m 58s
test-platforms (3.12, macos-latest, asyncio)	2m 57s
test-platforms (3.12, windows-latest, asyncio)	5m 0s
Regression Tests	1s
	1h 56m 8s

Provide feedback