Merge #731: Implement Deref<Target=Client> for RpcBlockchain

a8f9f6c RpcBlockchain derefs to the underlying RPC Client (rajarshimaitra)

Pull request description:

  <!-- You can erase any parts of this template not applicable to your Pull Request. -->

  ### Description

  For the same reason as #705  and #722 ..

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
  * [x] I ran `cargo fmt` and `cargo clippy` before committing

ACKs for top commit:
  afilini:
    ACK a8f9f6c

Tree-SHA512: 81e596fe451c275ca0ce27ee7ac9cf7e88433775603021c2dd1cd26a26558531cf74f81ef05d0ae9d5d0e59e91196e3ac6d38c0f4853b1889ddf822d8e63e178

src/blockchain/rpc.rs

@@ -50,6 +50,7 @@ use bitcoincore_rpc::{Client, RpcApi};
 use log::{debug, info};
 use serde::{Deserialize, Serialize};
 use std::collections::{HashMap, HashSet};
+use std::ops::Deref;
 use std::path::PathBuf;
 use std::thread;
 use std::time::Duration;
@@ -67,6 +68,14 @@ pub struct RpcBlockchain {
     sync_params: RpcSyncParams,
 }
 
+impl Deref for RpcBlockchain {
+    type Target = Client;
+
+    fn deref(&self) -> &Self::Target {
+        &self.client
+    }
+}
+
 /// RpcBlockchain configuration options
 #[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
 pub struct RpcConfig {