feat: CID gravity connector #425

Job	Run time
ci-lint	20s
build-2k	4m 22s
build-calibnet	4m 35s
build-debug	4m 14s
build-forest	4m 42s
build-mainnet	4m 16s
gen-check	9m 28s
gofmt	18s
lint	3m 26s
mod-tidy-check	31s
setup-params	3s
test (test-itest-curio, ./itests/curio_test.go)	7m 13s
test (test-all, `go list ./... \| grep -v curio/itests`)	3m 13s
test (test-itest-harmonyDB, ./itests/harmonydb_test.go)	2m 45s
test (test-itest-alertnow, ./itests/alertnow_test.go)	1m 36s
	51m 2s

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