Feature: Add an in-memory wallet backend framework #5252

Job	Run time
Bitrot check	2m 35s
Build target wasm32-wasi	2m 19s
Latest build on ubuntu-latest	2m 6s
Latest build on windows-latest	3m 38s
Check ZFuture build on Linux	3m 24s
Latest build on macOS-latest	2m 54s
Clippy (MSRV)	2m 42s
Check ZFuture build on macOS	4m 26s
Check ZFuture build on Windows	7m 44s
Code coverage	18m 36s
Clippy (beta)	18s
Intra-doc links	3m 7s
Rustfmt	16s
protobuf consistency	2m 28s
UUID validity	7s
Test on Linux	9m 52s
Test Orchard on Linux	11m 51s
Test NU6 on Linux	9m 42s
Test on macOS	38m 49s
Test Orchard on macOS	21m 27s
Test on Windows	14m 46s
Test Orchard on Windows	18m 46s
Test NU6 on Windows	15m 27s
	3h 17m 20s

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