feat: CID gravity connector #503

Job	Run time
ci-lint	16s
build-debug	4m 29s
build-2k	4m 24s
build-mainnet	4m 33s
build-calibnet	4m 19s
build-forest	4m 57s
lint	3m 33s
gen-check	10m 19s
setup-params	5s
gofmt	16s
mod-tidy-check	27s
test (test-itest-curio, ./itests/curio_test.go)	8m 22s
test (test-all, `go list ./... \| grep -v curio/itests`)	4m 38s
test (test-itest-harmonyDB, ./itests/harmonydb_test.go)	3m 2s
test (test-itest-alertnow, ./itests/alertnow_test.go)	3m 1s
	56m 41s

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