feat: add utility to test keychains persistence #10

Job	Run time
Rust fmt	14s
prepare	5s
Check no_std	29s
Rust clippy	2m 3s
Build & Test Examples (example_wallet_rpc)	32s
Build & Test Examples (example_wallet_esplora_async)	56s
Build & Test Examples (example_wallet_electrum)	56s
Build & Test Examples (example_wallet_esplora_blocking)	50s
Check WASM	1m 45s
Build & Test (ubuntu-latest, 1.63.0, --no-default-features --features miniscript/no-std,bdk_chain...	38s
Build & Test (ubuntu-latest, 1.88.0, true, --no-default-features --features miniscript/no-std,bdk...	50s
Build & Test (ubuntu-latest, 1.88.0, true, --all-features)	49s
Build & Test (ubuntu-latest, 1.63.0, --all-features)	34s
Build & Test (ubuntu-24.04-arm, 1.88.0, true, --all-features)	46s
Build & Test (ubuntu-24.04-arm, 1.88.0, true, --no-default-features --features miniscript/no-std,...	44s
Build & Test (ubuntu-24.04-arm, 1.63.0, --all-features)	46s
Build & Test (ubuntu-24.04-arm, 1.63.0, --no-default-features --features miniscript/no-std,bdk_ch...	41s
	13m 38s

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