Add user settings registry

[larkox]

Summary

Add user settings functionality to the demo plugin

Ticket Link

https://mattermost.atlassian.net/browse/MM-55755

Related to:

mattermost/mattermost#25517

[larkox]

For some reason I wasn't able to build the webapp part of the plugin, so I took the liberty to bump the dependencies.

[hanzei]

Nice one 👍

[marianunez]

Can we add the documentation in the webapp Readme of how this new registry would look like? here -> https://github.com/mattermost/mattermost-plugin-demo/tree/master/webapp#main-menu-action

[marianunez]

Thanks @larkox! Do we need to bump the min server version for support of this new registry? https://github.com/mattermost/mattermost-plugin-demo/blob/308bdd639fb46a97ab0487a69bf4260b6ae16127/plugin.json#L9C6-L9C24

[larkox]

@marianunez Not really. The code checks whether the registry exist, and use it if it exist, and doesn't use it if not. Therefore... the plugin can work with previous versions (it won't show the settings, thought).

[yasserfaraazkhan]

able to save options

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d6a03f3) 3.10% compared to head (17e8931) 3.10%.

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #172   +/-   ##
======================================
  Coverage    3.10%   3.10%           
======================================
  Files          15      15           
  Lines        1869    1869           
======================================
  Hits           58      58           
  Misses       1809    1809           
  Partials        2       2           

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[larkox]

/update-branch