build

feat: add interface stubs for async adapters #467

Job	Run time
Run Linters	1s
test (3.9, ubuntu-latest)	50s
test (3.9, macOS-latest)	1m 26s
test (3.9, windows-latest)	1m 23s
test (3.10, ubuntu-latest)	54s
test (3.10, macOS-latest)	1m 16s
test (3.10, windows-latest)	1m 30s
test (3.11, ubuntu-latest)	51s
test (3.11, macOS-latest)	1m 26s
test (3.11, windows-latest)	1m 25s
Indicate completion to coveralls.io	13s
Release	18s
	11m 33s

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