Add gated Gravity Index tool (#567) #6320

Job	Run time
build-and-check	2m 59s
test-integration-packages/internal	1m 10s
test-integration-sdk	1m 15s
test-integration-web	44s
test-integration-packages/agent-runtime	42s
test-packages/agent-runtime	45s
test-integration-common	43s
test-sdk	46s
test-packages/billing	43s
test-packages/internal	54s
test-.agents	39s
test-integration-cli	49s
test-common	57s
test-cli	50s
test-web	1m 50s
test-integration-packages/billing	1m 24s
	17m 10s

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