circuit: Make `TxInputNote` fields public #420

Job	Run time
Code Analysis / Rust Format	7s
test cirucits / Run tests	3m 4s
Code Analysis / Clippy Check	16s
Dusk Analyzer / Dusk Analyzer	7s
test core / Run tests	11s
test core rkyv compiles / Run tests	12s
	3m 57s

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