Add methods to ProposedTransaction and description builders to build zk circuits #2579

Job	Run time
Check Rust	6m 57s
Vet Dependencies	2m 46s
Test ironfish-rust (1/2)	6m 25s
Test ironfish-rust (2/2)	5m 54s
Test ironfish-rust (all features) (1/2)	4m 16s
Test ironfish-rust (all features) (2/2)	4m 6s
Test ironfish-rust (no default features) (1/2)	2m 5s
Test ironfish-rust (no default features) (2/2)	2m 2s
Test ironfish-rust-wasm	1m 48s
Test ironfish-zkp	2m 3s
Lint Rust	1m 17s
	39m 39s

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