Preparatory refactoring for zcash/librustzcash#1673 #6353

Job	Run time
Bitrot check	1m 29s
Latest build on ubuntu-latest	1m 25s
Latest build on windows-latest	1m 20s
Latest build on macOS-latest	1m 19s
Build target wasm32-wasi	55s
Build target thumbv7em-none-eabihf	32s
Check ZFuture build on Linux	26s
Clippy (MSRV)	1m 5s
Check ZFuture build on macOS	27s
Check ZFuture build on Windows	25s
Clippy (beta)	14s
Code coverage	4m 12s
Intra-doc links	2m 10s
Rustfmt	15s
protobuf consistency	1m 1s
Test no-Orchard on Linux	2m 38s
Test no-Orchard on macOS	3m 22s
Test Orchard on Linux	1m 39s
Slow Test Orchard on Linux	2m 33s
Test Orchard on macOS	3m 3s
Test NU7 on Linux	2m 34s
Slow Test NU7 on Linux	2m 30s
UUID validity	6s
Test no-Orchard on Windows	5m 52s
Test Orchard on Windows	5m 45s
Test NU7 on Windows	4m 43s
Required status checks have passed	1s
	52m 1s

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