feat: CID gravity connector #467

Job	Run time
ci-lint	11s
build-calibnet	4m 17s
build-debug	4m 50s
build-2k	4m 21s
build-forest	4m 29s
build-mainnet	4m 21s
gen-check	9m 40s
gofmt	13s
lint	3m 23s
mod-tidy-check	1m 50s
setup-params	5s
test (test-itest-curio, ./itests/curio_test.go)	6m 59s
test (test-all, `go list ./... \| grep -v curio/itests`)	3m 14s
test (test-itest-harmonyDB, ./itests/harmonydb_test.go)	3m 7s
test (test-itest-alertnow, ./itests/alertnow_test.go)	1m 43s
	52m 43s

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