equihash: Add Rust API for Tromp solver #4234

Job	Run time
Test on ubuntu-latest	3m 40s
Bitrot check	2m 38s
Test on windows-latest	3m 21s
Latest build on ubuntu-latest	1m 59s
Build target wasm32-wasi	1m 31s
Test on macOS-latest	3m 22s
Latest build on windows-latest	1m 38s
Latest build on macOS-latest	1m 17s
Clippy (MSRV)	3m 7s
Clippy (beta)	13s
Code coverage	21m 0s
Intra-doc links	3m 17s
Rustfmt	12s
UUID validity	4s
	47m 19s

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