pczt: Define the structure and semantics of the PCZT format #6107

Job	Run time
Bitrot check	1m 36s
Latest build on ubuntu-latest	2m 17s
Build target wasm32-wasi	54s
Check ZFuture build on Linux	2m 1s
Latest build on windows-latest	4m 3s
Clippy (MSRV)	40s
Check ZFuture build on macOS	1m 41s
Latest build on macOS-latest	1m 48s
Check ZFuture build on Windows	5m 50s
Clippy (beta)	11s
Code coverage	1h 34m 23s
Intra-doc links	2m 14s
Rustfmt	14s
protobuf consistency	1m 6s
UUID validity	3s
Test on Linux	6m 34s
Test Orchard on Linux	2m 35s
Test NU7 on Linux	6m 35s
Test on macOS	12m 47s
Test Orchard on macOS	3m 48s
Test on Windows	11m 15s
Test Orchard on Windows	6m 3s
Test NU7 on Windows	14m 28s
Required status checks have passed	1s
	3h 3m 7s

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