perf(store): save metadata async #2421

Job	Run time
Detect code changes	6s
Determine Image Tag	3s
proto / buf-check	7s
test / Build All ev-node Binaries	1m 49s
test / Run Integration Tests	2m 15s
test / Run Unit Tests	3m 9s
lint / golangci-lint	1m 34s
lint / hadolint	14s
test / Go Mod Tidy Check	41s
lint / markdown-lint	28s
lint / yamllint	10s
lint / goreleaser-check	11s
docker / Build ev-node-testapp	20m 20s
docker / Build ev-node-evm	20m 22s
docker / Build ev-node-grpc	16m 18s
test / Run EVM Execution Tests	2m 2s
test / Run E2E System Tests	12m 33s
test / Combine and Upload Coverage	15s
docker-tests / Docker Compatibility E2E Tests	4m 26s
docker-tests / Docker E2E Tests	7m 0s
docker-tests / Docker Upgrade E2E Tests	4m 3s
	1h 38m 6s

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