feat: add utilities to test persistence of wallet #14

Job	Run time
Rust fmt	16s
prepare	6s
Rust clippy	58s
Check no_std	37s
Check WASM	1m 33s
Build & Test (ubuntu-latest, 1.63.0, --all-features)	1m 36s
Build & Test (ubuntu-latest, 1.88.0, true, --all-features)	1m 24s
Build & Test (ubuntu-latest, 1.88.0, true, --no-default-features --features miniscript/no-std,bdk...	1m 21s
Build & Test (ubuntu-latest, 1.63.0, --no-default-features --features miniscript/no-std,bdk_chain...	1m 38s
Build & Test (ubuntu-24.04-arm, 1.88.0, true, --no-default-features --features miniscript/no-std,...	1m 25s
Build & Test Examples (example_wallet_electrum)	59s
Build & Test Examples (example_wallet_rpc)	48s
Build & Test Examples (example_wallet_esplora_async)	1m 2s
Build & Test Examples (example_wallet_esplora_blocking)	54s
Build & Test (ubuntu-24.04-arm, 1.88.0, true, --all-features)	1m 20s
Build & Test (ubuntu-24.04-arm, 1.63.0, --all-features)	1m 33s
Build & Test (ubuntu-24.04-arm, 1.63.0, --no-default-features --features miniscript/no-std,bdk_ch...	1m 34s
	19m 4s

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