[12.x] Add DatabaseStore::setConnection(), fix docblock for setLockConnection() (#56554)

* Add DatabaseStore::setConnection(), fix docblock for setLockConnection()

* Add getLockConnection() for consistency

* Update DatabaseStore.php

---------

Co-authored-by: Taylor Otwell <[email protected]>

Author: stancl

src/Illuminate/Cache/DatabaseStore.php

@@ -446,7 +446,30 @@ public function getConnection()
     }
 
     /**
-     * Specify the name of the connection that should be used to manage locks.
+     * Set the underlying database connection.
+     *
+     * @param  \Illuminate\Database\ConnectionInterface  $connection
+     * @return $this
+     */
+    public function setConnection($connection)
+    {
+        $this->connection = $connection;
+
+        return $this;
+    }
+
+    /**
+     * Get the connection used to manage locks.
+     *
+     * @return \Illuminate\Database\ConnectionInterface
+     */
+    public function getLockConnection()
+    {
+        return $this->lockConnection;
+    }
+
+    /**
+     * Specify the connection that should be used to manage locks.
      *
      * @param  \Illuminate\Database\ConnectionInterface  $connection
      * @return $this