draft(electrum): validate_merkle test #260

Job	Run time
Check no_std	18s
Build and test (stable, true, --no-default-features --features miniscript/no-std)	1m 28s
Build & Test Examples (example_cli)	15s
Build and test (stable, true, --all-features)	1m 42s
Check WASM	33s
Build & Test Examples (example_bitcoind_rpc_polling)	36s
Build and test (1.63.0, --no-default-features --features miniscript/no-std)	1m 45s
Rust fmt	11s
Build & Test Examples (example_electrum)	53s
Build and test (1.63.0, --all-features)	1m 43s
prepare	3s
Build & Test Examples (example_esplora)	1m 4s
Build & Test Examples (example_wallet_electrum)	52s
Build & Test Examples (example_wallet_esplora_async)	1m 3s
Build & Test Examples (example_wallet_esplora_blocking)	1m 2s
Build & Test Examples (example_wallet_rpc)	35s
clippy_check	30s
	14m 33s

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