Use Curve Prices API for pool volume #1069

Job	Run time
Generate comparison results	2m 59s
Test source with coverage	8m 49s
Test package (3.11 on ubuntu-latest)	4m 40s
Test package (3.11 on macos-latest)	5m 18s
Test package (3.10 on ubuntu-latest)	3m 53s
Test package (3.10 on macos-latest)	6m 31s
Test package (3.10 on windows-latest)	5m 31s
Test package (3.9 on ubuntu-latest)	5m 2s
Test package (3.9 on macos-latest)	4m 38s
Test package (3.9 on windows-latest)	6m 22s
Test package (3.8 on ubuntu-latest)	3m 39s
Test package (3.8 on macos-latest)	5m 3s
	1h 2m 25s

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