build

feat: add interface stubs for async adapters #468

Job	Run time
Run Linters	1m 59s
test (3.9, ubuntu-latest)	53s
test (3.9, macOS-latest)	1m 26s
test (3.9, windows-latest)	1m 13s
test (3.10, ubuntu-latest)	51s
test (3.10, macOS-latest)	1m 10s
test (3.10, windows-latest)	1m 26s
test (3.11, ubuntu-latest)	54s
test (3.11, macOS-latest)	1m 36s
test (3.11, windows-latest)	1m 44s
Indicate completion to coveralls.io	17s
Release	17s
	13m 46s

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