Add gated Gravity Index tool #6314

Job	Run time
build-and-check	3m 4s
test-integration-packages/billing	1m 4s
test-integration-packages/internal	1m 13s
test-integration-web	47s
test-integration-common	46s
test-integration-sdk	1m 17s
test-integration-cli	51s
test-common	49s
test-integration-packages/agent-runtime	52s
test-.agents	40s
test-cli	57s
test-packages/billing	49s
test-packages/internal	59s
test-packages/agent-runtime	50s
test-web	1m 5s
test-sdk	47s
	16m 50s

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