Add gated Gravity Index tool #6313

Job	Run time
build-and-check	3m 3s
test-integration-packages/billing	1m 6s
test-integration-packages/internal	1m 13s
test-integration-sdk	1m 14s
test-integration-cli	44s
test-integration-packages/agent-runtime	44s
test-integration-web	45s
test-integration-common	47s
test-packages/internal	56s
test-packages/billing	47s
test-.agents	43s
test-packages/agent-runtime	48s
test-common	51s
test-cli	55s
test-sdk	53s
test-web	1m 4s
	16m 33s

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