Add hooks for "avatar updated" and "avatar deleted", to make SLA more "pluggable" in the WP ecosystem.

[t-lock]

Is your enhancement related to a problem? Please describe.

I have been using this plugin for awhile and love it's functionality. However, an issue came up recently when I was trying to share the local avatar with an outside service that sits next to Wordpress in our larger application context.

Specifically, I needed to share this avatar with the remote service whenever it changed, or when it was deleted (to clear the remote avatar back to default).

Generally, this feature is also useful for any developers who are implementing their own "edit profile" (and edit avatar) functionality outside of the Wordpress in-admin flow. Really, the use cases are enumerable. Exposing SLA's core events as hooks serves to help SLA "play nice with others".

Designs

No response

Describe alternatives you've considered

I have tried as many ways as I could think of to achieve this with existing wordpress hooks and filters surrounding profile updates and avatars. However, none of these attempts was "bulletproof". In one case, I thought I had a working solution, but Simple Local Avatar's caching functionality was causing false-positives to fire on page-load, so I was sharing the avatar with the remote on every page load.

I wish I could be more specific here on each thing that I tried, but since my final "bulletproof" solution involved forking the SLA plugin and adding these hooks, I have lost those previous attempts to the ether.

Shortly, I will submit a simple PR which adds this functionality. If accepted, documentation would need to be added as well.
EDIT: PR: #149

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