WASM: add bindings for unsigned transactions and descriptions #2528

Job	Run time
Check Rust	6m 57s
Vet Dependencies	2m 56s
Lint Rust	1m 20s
Test ironfish-rust (1/2)	6m 36s
Test ironfish-rust (all features) (1/2)	3m 44s
Test ironfish-rust (no default features) (1/2)	1m 25s
Test ironfish-rust (2/2)	6m 3s
Test ironfish-rust (all features) (2/2)	3m 28s
Test ironfish-rust (no default features) (2/2)	1m 27s
Test ironfish-zkp	2m 9s
Test ironfish-rust-wasm	2m 8s
	38m 13s

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