WASM: add bindings for `Scalar.zero()` and `Fr.from_bytes()` #2583

# to view logs

Job	Run time
Check Rust	7m 12s
Lint Rust	1m 16s
Vet Dependencies	2m 50s
Test ironfish-rust (1/2)	6m 23s
Test ironfish-rust (2/2)	5m 46s
Test ironfish-rust (all features) (1/2)	4m 18s
Test ironfish-rust (all features) (2/2)	4m 3s
Test ironfish-rust (no default features) (1/2)	1m 59s
Test ironfish-rust (no default features) (2/2)	1m 57s
Test ironfish-rust-wasm	1m 57s
Test ironfish-zkp	1m 58s
	39m 39s

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