feat: CID gravity connector #490

Job	Run time
ci-lint	11s
build-calibnet	4m 24s
build-2k	4m 26s
build-forest	4m 25s
build-mainnet	4m 23s
build-debug	4m 25s
gen-check	9m 46s
gofmt	13s
lint	3m 31s
mod-tidy-check	33s
setup-params	4s
test (test-itest-curio, ./itests/curio_test.go)	6m 52s
test (test-all, `go list ./... \| grep -v curio/itests`)	3m 27s
test (test-itest-harmonyDB, ./itests/harmonydb_test.go)	3m 3s
test (test-itest-alertnow, ./itests/alertnow_test.go)	2m 1s
	51m 44s

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