pczt: Add output field for storing the user-facing address #3274

Job	Run time
Build target wasm32-wasi	1m 30s
Latest build on ubuntu-latest	49s
Test on ubuntu-latest	10m 1s
Latest build on windows-latest	2m 56s
Test on windows-latest	11m 13s
Test on macOS-latest	7m 41s
Latest build on macOS-latest	47s
Bitrot check	2m 3s
Book tests	13s
Code coverage	9m 19s
Intra-doc links	2m 11s
Rustfmt	18s
	49m 1s

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