feat: add utilities for testing persistence #7

Job	Run time
Rust fmt	16s
prepare	4s
Check no_std	28s
Check WASM	1m 30s
Build & Test (ubuntu-latest, 1.88.0, true, --all-features)	47s
Build & Test (ubuntu-latest, 1.63.0, --all-features)	7s
Build & Test (ubuntu-24.04-arm, 1.63.0, --no-default-features --features miniscript/no-std,bdk_ch...	5s
Build & Test (ubuntu-latest, 1.88.0, true, --no-default-features --features miniscript/no-std,bdk...	7s
Build & Test (ubuntu-24.04-arm, 1.88.0, true, --no-default-features --features miniscript/no-std,...	1s
Build & Test (ubuntu-24.04-arm, 1.88.0, true, --all-features)	1s
Build & Test (ubuntu-latest, 1.63.0, --no-default-features --features miniscript/no-std,bdk_chain...	19s
Rust clippy	54s
Build & Test Examples (example_wallet_electrum)	1m 2s
Build & Test (ubuntu-24.04-arm, 1.63.0, --all-features)	28s
Build & Test Examples (example_wallet_esplora_async)	55s
Build & Test Examples (example_wallet_esplora_blocking)	55s
Build & Test Examples (example_wallet_rpc)	31s
	8m 30s

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