draft(electrum): validate_merkle test #257

Job	Run time
Check no_std	45s
Build and test (stable, true, --no-default-features --features miniscript/no-std)	39s
Build & Test Examples (example_cli)	44s
Build and test (stable, true, --all-features)	49s
Check WASM	1m 17s
Build and test (1.63.0, --no-default-features --features miniscript/no-std)	36s
Rust fmt	13s
Build & Test Examples (example_bitcoind_rpc_polling)	49s
Build and test (1.63.0, --all-features)	33s
Build & Test Examples (example_electrum)	1m 1s
prepare	2s
Build & Test Examples (example_esplora)	1m 8s
Build & Test Examples (example_wallet_electrum)	57s
Build & Test Examples (example_wallet_esplora_async)	1m 6s
Build & Test Examples (example_wallet_esplora_blocking)	1m 2s
Build & Test Examples (example_wallet_rpc)	43s
clippy_check	1m 34s
	13m 58s

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