Add gated Gravity Index tool #6309

Job	Run time
build-and-check	2m 47s
test-integration-packages/billing	1m 4s
test-integration-packages/internal	1m 8s
test-integration-packages/agent-runtime	41s
test-integration-web	52s
test-integration-cli	46s
test-integration-common	52s
test-integration-sdk	1m 17s
test-common	47s
test-web	1m 8s
test-packages/internal	52s
test-packages/agent-runtime	42s
test-packages/billing	46s
test-cli	50s
test-sdk	51s
test-.agents	43s
	16m 6s

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