Merge bitcoindevkit/bdk#1612: Refactor: Move transaction testing util… #1346

Job	Run time
Build & Test Examples (example_cli)	2m 28s
Build and test (stable, true, --no-default-features --features miniscript/no-std)	3m 43s
Build & Test Examples (example_bitcoind_rpc_polling)	31s
Build and test (stable, true, --all-features)	4m 0s
Check no_std	2m 33s
Build & Test Examples (example_electrum)	51s
Build and test (1.63.0, --no-default-features --features miniscript/no-std)	4m 33s
Build & Test Examples (example_esplora)	54s
Build and test (1.63.0, --all-features)	5m 14s
Build & Test Examples (example_wallet_electrum)	49s
Check WASM	2m 53s
Build & Test Examples (example_wallet_esplora_async)	57s
Rust fmt	4s
Build & Test Examples (example_wallet_esplora_blocking)	54s
Build & Test Examples (example_wallet_rpc)	29s
prepare	3s
clippy_check	2m 49s
	33m 45s

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