support `prof.dump` and `prof.prefix` #116

Job	Run time
Rustfmt and Clippy	2m 3s
Benchmarks using x86_64-unknown-linux-gnu (nightly)	57s
aarch64-unknown-linux-gnu	1s
x86_64-unknown-linux-gnu (nightly)	4m 28s
x86_64-unknown-linux-gnu (stable)	4m 10s
x86_64-unknown-linux-musl	4m 29s
x86_64-apple-darwin (stable)	4m 29s
	20m 37s

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