Rust: remove unnecessary uses of dynamic dispatch #2523

Job	Run time
Check Rust	7m 7s
Vet Dependencies	3m 7s
Test ironfish-rust (1/2)	6m 22s
Test ironfish-rust (2/2)	5m 51s
Test ironfish-rust (all features) (1/2)	3m 41s
Test ironfish-rust (no default features) (1/2)	1m 24s
Test ironfish-rust (all features) (2/2)	3m 26s
Test ironfish-rust (no default features) (2/2)	1m 23s
Test ironfish-rust-wasm	2m 15s
Test ironfish-zkp	2m 3s
Lint Rust	1m 26s
	38m 5s

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