WASM: add bindings for unsigned transactions and descriptions #2520

Job	Run time
Vet Dependencies	2m 57s
Lint Rust	1m 20s
Check Rust	6m 57s
Test ironfish-rust (1/2)	6m 18s
Test ironfish-rust (2/2)	5m 57s
Test ironfish-rust (all features) (1/2)	3m 0s
Test ironfish-rust (no default features) (1/2)	44s
Test ironfish-rust (all features) (2/2)	2m 48s
Test ironfish-rust (no default features) (2/2)	43s
Test ironfish-zkp	42s
Test ironfish-rust-wasm	1m 8s
	32m 34s

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