Implement GSSAPI authentication #521

Job	Run time	Billable time
test-postgres (9.5)	2m 32s	0s
test-platforms (3.8, ubuntu-latest, asyncio)	1s	0s
test-postgres (9.6)	2m 32s	0s
test-platforms (3.8, ubuntu-latest, uvloop)	1s	0s
test-postgres (10)	2m 22s	0s
test-platforms (3.8, macos-latest, asyncio)	1s	0s
test-postgres (11)	2m 21s	0s
test-platforms (3.8, macos-latest, uvloop)	1s	0s
test-postgres (12)	2m 24s	0s
test-platforms (3.8, windows-latest, asyncio)	1s	0s
test-platforms (3.9, ubuntu-latest, asyncio)	1s	0s
test-postgres (13)	2m 28s	0s
test-platforms (3.9, ubuntu-latest, uvloop)	1s	0s
test-postgres (14)	2m 16s	0s
test-platforms (3.9, macos-latest, asyncio)	1s	0s
test-postgres (15)	2m 22s	0s
test-platforms (3.9, macos-latest, uvloop)	1s	0s
test-postgres (16)	2m 21s	0s
test-platforms (3.9, windows-latest, asyncio)	1s	0s
test-platforms (3.10, ubuntu-latest, asyncio)	1m 54s	0s
test-platforms (3.10, ubuntu-latest, uvloop)	1m 54s	0s
test-platforms (3.10, macos-latest, asyncio)	1m 58s	0s
test-platforms (3.10, macos-latest, uvloop)	1m 57s	0s
test-platforms (3.10, windows-latest, asyncio)	1m 55s	0s
test-platforms (3.11, ubuntu-latest, asyncio)	1m 45s	0s
test-platforms (3.11, ubuntu-latest, uvloop)	1m 50s	0s
test-platforms (3.11, macos-latest, asyncio)	2m 2s	0s
test-platforms (3.11, macos-latest, uvloop)	2m 3s	0s
test-platforms (3.11, windows-latest, asyncio)	1m 55s	0s
test-platforms (3.12, ubuntu-latest, asyncio)	1s	0s
test-platforms (3.12, macos-latest, asyncio)	2m 1s	0s
test-platforms (3.12, windows-latest, asyncio)	1s	0s
Regression Tests	0s	0s
	43m 4s	0s

Provide feedback