patch 8.2.2128: there is no way to do something on CTRL-Z

Problem:    There is no way to do something on CTRL-Z.
Solution:   Add VimSuspend and VimResume autocommand events. (closes #7450)
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 11e4bf5..0788fa3 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -5864,6 +5864,7 @@
     {
 	if (!eap->forceit)
 	    autowrite_all();
+	apply_autocmds(EVENT_VIMSUSPEND, NULL, NULL, FALSE, NULL);
 	windgoto((int)Rows - 1, 0);
 	out_char('\n');
 	out_flush();
@@ -5881,6 +5882,7 @@
 	scroll_start();		// scroll screen before redrawing
 	redraw_later_clear();
 	shell_resized();	// may have resized window
+	apply_autocmds(EVENT_VIMRESUME, NULL, NULL, FALSE, NULL);
     }
 }