Add typings #529

Job	Run time
test-postgres (9.5)	3m 3s
test-platforms (3.8, ubuntu-latest, asyncio)	2m 8s
test-postgres (9.6)	2m 57s
test-platforms (3.8, ubuntu-latest, uvloop)	2m 14s
test-postgres (10)	2m 27s
test-platforms (3.8, macos-latest, asyncio)	2m 54s
test-postgres (11)	2m 32s
test-platforms (3.8, macos-latest, uvloop)	2m 35s
test-postgres (12)	2m 41s
test-platforms (3.8, windows-latest, asyncio)	5m 32s
test-postgres (13)	2m 50s
test-platforms (3.9, ubuntu-latest, asyncio)	2m 18s
test-postgres (14)	2m 30s
test-platforms (3.9, ubuntu-latest, uvloop)	2m 11s
test-postgres (15)	2m 37s
test-platforms (3.9, macos-latest, asyncio)	2m 51s
test-postgres (16)	2m 30s
test-platforms (3.9, macos-latest, uvloop)	2m 42s
test-platforms (3.9, windows-latest, asyncio)	5m 4s
test-platforms (3.10, ubuntu-latest, asyncio)	1m 56s
test-platforms (3.10, ubuntu-latest, uvloop)	2m 3s
test-platforms (3.10, macos-latest, asyncio)	3m 4s
test-platforms (3.10, macos-latest, uvloop)	3m 39s
test-platforms (3.10, windows-latest, asyncio)	4m 58s
test-platforms (3.11, ubuntu-latest, asyncio)	1m 58s
test-platforms (3.11, ubuntu-latest, uvloop)	1m 55s
test-platforms (3.11, macos-latest, asyncio)	3m 27s
test-platforms (3.11, macos-latest, uvloop)	2m 52s
test-platforms (3.11, windows-latest, asyncio)	5m 18s
test-platforms (3.12, ubuntu-latest, asyncio)	2m 3s
test-platforms (3.12, macos-latest, asyncio)	2m 56s
test-platforms (3.12, windows-latest, asyncio)	5m 47s
Regression Tests	0s
	1h 36m 32s

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