feat: TraceQL metrics: average over time #9459

Job	Run time
Lint	3m 38s
Run Unit Tests (test-with-cover-pkg)	3m 15s
Benchmark	9m 35s
Run Unit Tests (test-with-cover-tempodb)	15m 42s
Build	1m 46s
Run Unit Tests (test-with-cover-tempodb-wal)	11m 22s
Build technical documentation	19s
Run integration tests (test-e2e)	20m 58s
Run Unit Tests (test-with-cover-others)	12m 26s
Run integration tests (test-integration-poller)	9m 47s
Check jsonnet & tempo-mixin	46s
Vendor check	1m 24s
Run integration tests (test-e2e-deployments)	13m 21s
Run integration tests (test-e2e-serverless)	7m 8s
	1h 51m 27s

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