Add event callback registration to the bindings

bindings/event.go

+///////////////////////////////////////////////////////////////////////////////
+// Copyright © 2020 xx network SEZC                                          //
+//                                                                           //
+// Use of this source code is governed by a license that can be found in the //
+// LICENSE file                                                              //
+///////////////////////////////////////////////////////////////////////////////
+
+package bindings
+
+// RegisterEventCallback records the given function to receive
+// ReportableEvent objects. It returns the internal index
+// of the callback so that it can be deleted later.
+func (c *Client) RegisterEventCallback(myFunc EventCallbackFunction) int {
+	return c.api.RegisterEventCallback(myFunc)
+}
+
+// UnregisterEventCallback deletes the callback identified by the
+// index. It returns an error if it fails.
+func (c *Client) UnregisterEventCallback(index int) error {
+	return c.api.UnregisterEventCallback(index)
+}