Add test for bitcoin-rpc-provider

[Tibo-lg]

Since switching to simple-wallet for the integration tests, the bitcoin-rpc-provider wallet implementation is completely untested. Possible solutions:

• get rid of it
• have a least one integration test using it
• have specific tests for it (doesn't feel like worth it as it's more a helper crate)

[h10086733]

I have a question,
let label_map=self
. client
. lock()
. unwrap()
. call:<HashMap<Address, Value>>（
"Getaddressesbylabel",
&[Value:: String (keys_id. to'lower_hex_string())],
）
. map_err (rpc_err_to_manager_err)?; The following problem is called in the above code:
Error sending offer channel: WalletError (RpcError (JsonRpc),
I only respond normally when using the following requests:
Bitcoin cli -- regtest rpcuser=testuser - rpcpassword=lq6zequb gYTdF2_ZEutr8ywTXzLYtknzWU4nV8uVoo=- rpcwallet=Bob getaddressesbylabel "bech32"
Can you explain the reason for the problem caused by this handling?