WASM: expose the `Transaction` type #2511

Job	Run time
Check Rust	5m 54s
Lint Rust	1m 18s
Vet Dependencies	2m 47s
Test ironfish-rust (1/2)	6m 10s
Test ironfish-rust (2/2)	5m 49s
Test ironfish-rust (all features) (1/2)	3m 4s
Test ironfish-rust-wasm	1m 43s
Test ironfish-rust (all features) (2/2)	2m 48s
Test ironfish-rust (no default features) (1/2)	52s
Test ironfish-zkp	55s
Test ironfish-rust (no default features) (2/2)	43s
	32m 3s

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