equihash: Add Rust API for Tromp solver #4235

Job	Run time
Test on ubuntu-latest	3m 25s
Latest build on ubuntu-latest	1m 53s
Latest build on windows-latest	1m 54s
Latest build on macOS-latest	27s
Test on windows-latest	3m 3s
Test on macOS-latest	54s
Bitrot check	2m 42s
Build target wasm32-wasi	1m 25s
Clippy (MSRV)	2m 57s
Clippy (beta)	13s
Code coverage	20m 42s
Intra-doc links	4m 7s
Rustfmt	10s
UUID validity	5s
	43m 57s

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