Feature suggestion: Add Apprise library to support more notification services

[etho201]

Apprise allows you to send a notification to almost all of the most popular notification services available to us today such as: Telegram, Discord, Slack, Amazon SNS, Gotify, etc.

Developers who wish to provide a notification service no longer need to research each and every one out there. They no longer need to try to adapt to the new ones that comeout thereafter. They just need to include this one library and then they can immediately gain access to almost all of the notifications services available to us today.

I submitted a feature request back in 2019 to add Gotify as a receiver. Now it seems it would be more efficient for the development team to simply add the Apprise library as this will gain access to Gotify and many other receivers all in one go.