[core] Support for bridge maintainers' donation URLs (#2102)

lib/BridgeInterface.php

@@ -120,6 +120,13 @@ interface BridgeInterface {
 	 */
 	public function getURI();
 
+	/**
+	 * Returns the bridge Donation URI
+	 *
+	 * @return string Bridge Donation URI
+	 */
+	public function getDonationURI();
+
 	/**
 	 * Returns the cache timeout
 	 *