WASM: expose the `MerkleNote` and `MerkleNoteHash` types #2508

Job	Run time
Lint Rust	1m 26s
Check Rust	5m 55s
Vet Dependencies	2m 50s
Test ironfish-rust (1/2)	6m 25s
Test ironfish-rust (2/2)	5m 58s
Test ironfish-rust (all features) (1/2)	2m 58s
Test ironfish-rust (no default features) (1/2)	51s
Test ironfish-rust (all features) (2/2)	2m 45s
Test ironfish-rust-wasm	1m 18s
Test ironfish-zkp	45s
Test ironfish-rust (no default features) (2/2)	40s
	31m 51s

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