WASM: add bindings for `EphemeralKeyPair` #2572

Job	Run time
Check Rust	5m 48s
Vet Dependencies	2m 56s
Test ironfish-rust (1/2)	6m 15s
Test ironfish-rust (2/2)	5m 57s
Test ironfish-rust (all features) (1/2)	3m 5s
Test ironfish-rust (all features) (2/2)	2m 47s
Test ironfish-rust (no default features) (1/2)	52s
Test ironfish-rust-wasm	50s
Test ironfish-rust (no default features) (2/2)	42s
Test ironfish-zkp	46s
Lint Rust	1m 19s
	31m 17s

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