Benchmarking tool using cost estimator #798

Job	Run time
Build target wasm32-unknown-unknown	1m 51s
Bitrot check	2m 49s
Build target wasm32-wasi	1m 32s
Rustfmt	14s
Intra-doc links	1m 26s
Test on ubuntu-latest with basic features	6m 51s
Test on windows-latest with basic features	8m 30s
Test on macOS-latest with basic features	7m 22s
Test on ubuntu-latest with all features	8m 26s
Test on windows-latest with all features	10m 57s
Test on macOS-latest with all features	14m 34s
	1h 4m 32s

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