build

feat: add interface stubs for async adapters (#335) #469

Job	Run time
Run Linters	1m 58s
test (3.9, ubuntu-latest)	53s
test (3.9, macOS-latest)	1m 12s
test (3.9, windows-latest)	1m 35s
test (3.10, ubuntu-latest)	52s
test (3.10, macOS-latest)	1m 59s
test (3.10, windows-latest)	1m 20s
test (3.11, ubuntu-latest)	49s
test (3.11, macOS-latest)	1m 25s
test (3.11, windows-latest)	1m 49s
Indicate completion to coveralls.io	14s
Release	2m 39s
	16m 45s

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