WASM: change the `PublicAddress.hex` getter to `PublicAddress.toHex()` #2573

Job	Run time
Check Rust	5m 46s
Vet Dependencies	2m 50s
Test ironfish-rust (1/2)	6m 17s
Test ironfish-rust (all features) (1/2)	4m 25s
Test ironfish-rust (2/2)	5m 58s
Test ironfish-rust (all features) (2/2)	4m 8s
Test ironfish-rust (no default features) (1/2)	2m 1s
Test ironfish-rust (no default features) (2/2)	2m 4s
Test ironfish-rust-wasm	1m 24s
Test ironfish-zkp	2m 5s
Lint Rust	1m 21s
	38m 19s

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