Add matrix notification module (#45823)
Add matrix notification module (#45823)

* Add matrix notification module

* try to make ansibot happy

* docs

* fix typo in encoding

* is ansibot happy now?

* change matrix python lib requirement description

* Example formatting & no_log

Thanks for this PR.
Few minor things that are easier for me to just fix, than explain and get you to fix.

* We suggest using `- name:` for examples, as Ansible best practice is to name your tasks
* To prevent secrets being leaked out use `no_log` in argspec
* use `requirements:` in `DOCUMENTATION`

* Clean up argument requirements

* Remove requirements duplicate

* not sure on syntax with these, were adapted from an example elsewhere

thaim/ansible,thaim/ansible