Add attributes to some messaging modules (#5962)
Add attributes to some messaging modules.
(cherry picked from commit 51394b55a0)
Co-authored-by: Felix Fontein <felix@fontein.de>
* first push: add discord module and test for notifications
* fix the yaml docs and edit the result output
* add link
* fix link
* fix docs and remove required=False in argument spec
* add elements specd and more info about embeds
* called str...
* elements for embeds oc.
* fix typo's in description and set checkmode to false
* edit docs and module return
* support checkmode with get method
* fix unit test
* handle exception and add new example for embeds
* quote line
* fix typos
* fix yaml