WASM: expose the `Transaction` type #2510

Job	Run time
Check Rust	5m 45s
Vet Dependencies	2m 59s
Lint Rust	1m 23s
Test ironfish-rust (1/2)	6m 16s
Test ironfish-rust (all features) (1/2)	3m 42s
Test ironfish-rust (no default features) (1/2)	1m 22s
Test ironfish-rust (2/2)	5m 59s
Test ironfish-rust (all features) (2/2)	3m 23s
Test ironfish-rust (no default features) (2/2)	1m 24s
Test ironfish-rust-wasm	1m 21s
Test ironfish-zkp	2m 1s
	35m 35s

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