Adds serializing of the cached addresses for an account #200

Job	Run time
Bitrot check	1m 36s
Build target wasm32-wasi	18s
Latest build on ubuntu-latest	17s
Latest build on windows-latest	11s
Check ZFuture build on Linux	2m 12s
Latest build on macOS-latest	10s
Clippy (MSRV)	38s
Check ZFuture build on macOS	1m 37s
Check ZFuture build on Windows	3m 35s
Clippy (beta)	16s
Code coverage	49m 54s
Intra-doc links	2m 18s
Rustfmt	13s
protobuf consistency	1m 7s
UUID validity	6s
Test on Linux	1s
Test Orchard on Linux	1s
Test NU6 on Linux	1s
Test on macOS	5m 24s
Test Orchard on macOS	5m 45s
Test on Windows	1s
Test Orchard on Windows	1s
Test NU6 on Windows	1s
	1h 15m 43s

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