Add support for async generator injections #1281

Job	Run time
Run tests with different pydantic versions	3m 12s
Run tests (3.10)	1m 59s
Run tests (3.12)	1m 55s
Run tests (3.8)	1m 52s
Run tests (3.9)	1m 57s
Run tests (3.13)	1m 59s
Run tests with coverage	2m 44s
Run tests (3.11)	1m 45s
Run linters (mypy)	1m 42s
Run linters (pydocstyle)	1m 33s
Run linters (flake8)	1m 31s
Run linters (pylint)	1m 34s
	23m 43s

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