Add legacy wallet tests

[realeinherjar]

This discussion came up on #1115.

Currently we are only testing segwit wallets:

bdk/crates/bdk/tests/common.rs

Lines 107 to 156 in f95506b

	pub fn get_funded_wallet(descriptor: &str) -> (Wallet, bitcoin::Txid) {
	get_funded_wallet_with_change(descriptor, None)
	}
	pub fn get_test_wpkh() -> &'static str {
	"wpkh(cVpPVruEDdmutPzisEsYvtST1usBR3ntr8pXSyt6D2YYqXRyPcFW)"
	}
	pub fn get_test_single_sig_csv() -> &'static str {
	// and(pk(Alice),older(6))
	"wsh(and_v(v:pk(cVpPVruEDdmutPzisEsYvtST1usBR3ntr8pXSyt6D2YYqXRyPcFW),older(6)))"
	}
	pub fn get_test_a_or_b_plus_csv() -> &'static str {
	// or(pk(Alice),and(pk(Bob),older(144)))
	"wsh(or_d(pk(cRjo6jqfVNP33HhSS76UhXETZsGTZYx8FMFvR9kpbtCSV1PmdZdu),and_v(v:pk(cMnkdebixpXMPfkcNEjjGin7s94hiehAH4mLbYkZoh9KSiNNmqC8),older(144))))"
	}
	pub fn get_test_single_sig_cltv() -> &'static str {
	// and(pk(Alice),after(100000))
	"wsh(and_v(v:pk(cVpPVruEDdmutPzisEsYvtST1usBR3ntr8pXSyt6D2YYqXRyPcFW),after(100000)))"
	}
	pub fn get_test_tr_single_sig() -> &'static str {
	"tr(cNJmN3fH9DDbDt131fQNkVakkpzawJBSeybCUNmP1BovpmGQ45xG)"
	}
	pub fn get_test_tr_with_taptree() -> &'static str {
	"tr(b511bd5771e47ee27558b1765e87b541668304ec567721c7b880edc0a010da55,{pk(cPZzKuNmpuUjD1e8jUU4PVzy2b5LngbSip8mBsxf4e7rSFZVb4Uh),pk(8aee2b8120a5f157f1223f72b5e62b825831a27a9fdf427db7cc697494d4a642)})"
	}
	pub fn get_test_tr_with_taptree_both_priv() -> &'static str {
	"tr(b511bd5771e47ee27558b1765e87b541668304ec567721c7b880edc0a010da55,{pk(cPZzKuNmpuUjD1e8jUU4PVzy2b5LngbSip8mBsxf4e7rSFZVb4Uh),pk(cNaQCDwmmh4dS9LzCgVtyy1e1xjCJ21GUDHe9K98nzb689JvinGV)})"
	}
	pub fn get_test_tr_repeated_key() -> &'static str {
	"tr(b511bd5771e47ee27558b1765e87b541668304ec567721c7b880edc0a010da55,{and_v(v:pk(cVpPVruEDdmutPzisEsYvtST1usBR3ntr8pXSyt6D2YYqXRyPcFW),after(100)),and_v(v:pk(cVpPVruEDdmutPzisEsYvtST1usBR3ntr8pXSyt6D2YYqXRyPcFW),after(200))})"
	}
	pub fn get_test_tr_single_sig_xprv() -> &'static str {
	"tr(tprv8ZgxMBicQKsPdDArR4xSAECuVxeX1jwwSXR4ApKbkYgZiziDc4LdBy2WvJeGDfUSE4UT4hHhbgEwbdq8ajjUHiKDegkwrNU6V55CxcxonVN/*)"
	}
	pub fn get_test_tr_with_taptree_xprv() -> &'static str {
	"tr(cNJmN3fH9DDbDt131fQNkVakkpzawJBSeybCUNmP1BovpmGQ45xG,{pk(tprv8ZgxMBicQKsPdDArR4xSAECuVxeX1jwwSXR4ApKbkYgZiziDc4LdBy2WvJeGDfUSE4UT4hHhbgEwbdq8ajjUHiKDegkwrNU6V55CxcxonVN/*),pk(8aee2b8120a5f157f1223f72b5e62b825831a27a9fdf427db7cc697494d4a642)})"
	}
	pub fn get_test_tr_dup_keys() -> &'static str {
	"tr(cNJmN3fH9DDbDt131fQNkVakkpzawJBSeybCUNmP1BovpmGQ45xG,{pk(8aee2b8120a5f157f1223f72b5e62b825831a27a9fdf427db7cc697494d4a642),pk(8aee2b8120a5f157f1223f72b5e62b825831a27a9fdf427db7cc697494d4a642)})"
	}

Do we want to support legacy wallets?
If yes, we need legacy wallet tests.

[ValuedMammal]

A couple ideas for this: we should change the assert_feerate macro to just a plain vanilla function - right now it's difficult to read and not very approachable. It should take in an optional descriptor string to calculate the satisfaction weight instead of assume the same P2WPKH_FAKE_WITNESS_SIZE for every psbt. We can add some legacy descriptors to wallet/tests/common.rs and then come up with a similar assert_feerate_legacy that contains logic specific to pre-segwit transactions.