Allow executemany to return rows #509

Job	Run time
test-postgres (9.5)	2m 47s
test-platforms (3.8, ubuntu-latest, asyncio)	2m 5s
test-postgres (9.6)	2m 39s
test-platforms (3.8, ubuntu-latest, uvloop)	2m 4s
test-postgres (10)	2m 24s
test-platforms (3.8, macos-latest, asyncio)	3m 1s
test-postgres (11)	2m 36s
test-platforms (3.8, macos-latest, uvloop)	3m 23s
test-postgres (12)	2m 28s
test-platforms (3.8, windows-latest, asyncio)	5m 28s
test-postgres (13)	2m 32s
test-platforms (3.9, ubuntu-latest, asyncio)	2m 6s
test-postgres (14)	2m 13s
test-platforms (3.9, ubuntu-latest, uvloop)	1m 59s
test-postgres (15)	2m 45s
test-platforms (3.9, macos-latest, asyncio)	2m 47s
test-postgres (16)	2m 22s
test-platforms (3.9, macos-latest, uvloop)	2m 40s
test-platforms (3.9, windows-latest, asyncio)	4m 55s
test-platforms (3.10, ubuntu-latest, asyncio)	1m 57s
test-platforms (3.10, ubuntu-latest, uvloop)	1m 55s
test-platforms (3.10, macos-latest, asyncio)	2m 32s
test-platforms (3.10, macos-latest, uvloop)	2m 34s
test-platforms (3.10, windows-latest, asyncio)	5m 5s
test-platforms (3.11, ubuntu-latest, asyncio)	1m 56s
test-platforms (3.11, ubuntu-latest, uvloop)	1m 50s
test-platforms (3.11, macos-latest, asyncio)	2m 52s
test-platforms (3.11, macos-latest, uvloop)	2m 54s
test-platforms (3.11, windows-latest, asyncio)	5m 34s
test-platforms (3.12, ubuntu-latest, asyncio)	2m 1s
test-platforms (3.12, macos-latest, asyncio)	2m 56s
test-platforms (3.12, windows-latest, asyncio)	5m 45s
Regression Tests	0s
	1h 33m 5s

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