Benchmarking tool using cost estimator #797

Job	Run time
Rustfmt	12s
Build target wasm32-unknown-unknown	1m 29s
Bitrot check	2m 40s
Build target wasm32-wasi	1m 22s
Test on ubuntu-latest with basic features	6m 43s
Intra-doc links	1m 14s
Test on windows-latest with basic features	8m 22s
Test on macOS-latest with basic features	6m 51s
Test on ubuntu-latest with all features	8m 25s
Test on windows-latest with all features	10m 47s
Test on macOS-latest with all features	15m 16s
	1h 3m 21s

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