Add client verbose logging support

Allow curl verbose logging to be configured at the client level. See also: https://curl.se/libcurl/c/CURLOPT_VERBOSE.html

include/coeurl/client.hpp

@@ -141,6 +141,13 @@ struct Client {
     /// @sa set_verify_peer
     bool does_verify_peer() { return this->verify_peer_; }
 
+    //! Set whether or not to log curl requests verbosely.
+    /// @sa verbose and also CURLOPT_VERBOSE
+    void verbose(bool verbose) { this->verbose_logging_ = verbose; }
+    /// @brief Query whether verbose logging is enabled or not
+    /// @sa verbose(bool)
+    bool verbose() { return this->verbose_logging_; }
+
     //! Timeout connection after the specified amount of seconds, if the server
     //! stops sending acks.
     void connection_timeout(long t) { connection_timeout_ = t; }
@@ -191,6 +198,7 @@ struct Client {
     std::atomic<bool> stopped{false};
     std::atomic<bool> prevent_new_requests{false};
     bool verify_peer_ = true;
+    bool verbose_logging_ = false;
 
     long connection_timeout_ = 0;