support `prof.dump` and `prof.prefix` #113

Job	Run time
Rustfmt and Clippy	2m 4s
Benchmarks using x86_64-unknown-linux-gnu (nightly)	50s
aarch64-unknown-linux-gnu	1s
x86_64-unknown-linux-gnu (nightly)	4m 9s
x86_64-unknown-linux-gnu (stable)	4m 19s
x86_64-unknown-linux-musl	4m 26s
x86_64-apple-darwin (stable)	4m 27s
	20m 16s

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