New pulse functions for pulse faces and new file for ring bell fns

New pulse functions for pulse faces and new file for ring bell fns

These new pulse functions allow pulse any defined face briefly.
The new file contains functions intended to be used in
`ring-bell-function' as alternatives to `visible-bell'.
* lisp/pulse.el (pulse-face-duration): New user option.
(pulse-flash-face): New function.
* lisp/ring-bell-fns.el (flash-face-attributes)
(flash-face-faces): New user options.
(flash-face-bell-function, flash-echo-area-bell-function):
New functions.  (bug#77715)

* etc/NEWS: Announce changes

(cherry picked from commit b25139a5322ae809fe32d91d55e2212cc91b1b38)