Add typings #528

Job	Run time
test-postgres (9.5)	3m 30s
test-postgres (9.6)	3m 16s
test-platforms (3.8, ubuntu-latest, asyncio)	2m 6s
test-postgres (10)	2m 29s
test-platforms (3.8, ubuntu-latest, uvloop)	2m 5s
test-platforms (3.8, macos-latest, asyncio)	2m 40s
test-platforms (3.8, macos-latest, uvloop)	2m 36s
test-postgres (11)	2m 14s
test-platforms (3.8, windows-latest, asyncio)	5m 31s
test-postgres (12)	2m 38s
test-platforms (3.9, ubuntu-latest, asyncio)	2m 4s
test-platforms (3.9, ubuntu-latest, uvloop)	2m 1s
test-postgres (13)	2m 48s
test-postgres (14)	2m 28s
test-platforms (3.9, macos-latest, asyncio)	2m 11s
test-platforms (3.9, macos-latest, uvloop)	2m 10s
test-postgres (15)	2m 39s
test-postgres (16)	2m 37s
test-platforms (3.9, windows-latest, asyncio)	4m 43s
test-platforms (3.10, ubuntu-latest, asyncio)	2m 0s
test-platforms (3.10, ubuntu-latest, uvloop)	2m 0s
test-platforms (3.10, macos-latest, asyncio)	2m 51s
test-platforms (3.10, macos-latest, uvloop)	2m 49s
test-platforms (3.10, windows-latest, asyncio)	5m 42s
test-platforms (3.11, ubuntu-latest, asyncio)	1m 57s
test-platforms (3.11, ubuntu-latest, uvloop)	1m 57s
test-platforms (3.11, macos-latest, asyncio)	3m 8s
test-platforms (3.11, macos-latest, uvloop)	3m 30s
test-platforms (3.11, windows-latest, asyncio)	5m 14s
test-platforms (3.12, ubuntu-latest, asyncio)	2m 26s
test-platforms (3.12, macos-latest, asyncio)	3m 42s
test-platforms (3.12, windows-latest, asyncio)	5m 41s
Regression Tests	0s
	1h 35m 43s

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