Feat : Get or create Key Value store #4432

Job	Run time
check docs (ubuntu-latest / stable)	1m 6s
check format (ubuntu-latest / nightly)	14s
check examples (ubuntu-latest / stable)	43s
check feature flags (ubuntu-latest / stable)	8m 25s
check licenses (ubuntu-latest / stable)	22s
check linter (ubuntu-latest / stable)	1m 25s
check minimal versions of transitive dependencies (ubuntu-latest / stable)	26s
check minimal supported rust version (ubuntu-latest / msrv)	34s
check spelling (ubuntu-latest / nightly)	5m 38s
test (ubuntu-latest / stable)	6m 1s
test (macos-latest / stable)	11m 44s
test (windows-latest / stable)	7m 32s
	44m 10s

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