Added Pusher Messaging Adapter

[kit-t]

What does this PR do?

Adds a new Push Adapter for sending push notification via Pusher.

Test Plan

• Create a free account on Pusher
• Add the following environment variables
  • PUSHER_INSTANCE_ID: <Pusher Beams instance id, can be found in the dashboard under Keys > Credentials>
  • PUSHER_SECRET_KEY: <Pusher Beams secret key, can be found in the dashboard under Keys > Credentials>
  • PUSHER_TO: <userId e.g. 'test-user-id'>
• Run test against tests/e2e/Push/PusherTest.php

Related PRs and Issues

resolves appwrite/appwrite#6398

Have you read the Contributing Guidelines on issues?

Yes

[kit-t]

Hi @wess, this is ready for review 🙂

[kit-t]

Looks good! Would you please attach a screenshot of a successful test to verify it all works?

Sure.

[gewenyu99]

Hey there! There were a lot of big PRs during this Hacktoberfest, and we wanted to give everyone ample time to collaborate with our engineering team. If you were able to merge your PRs during October, amazing. If it’s still not merged, don’t worry about it either. Either way, we’ve got your Hacktoberfest swag minted and ready to ship.

Please comment with your Discord username here so we can contact you about your shipping information to deliver your Hacktoberfest swag.

[kit-t]

Hey there! There were a lot of big PRs during this Hacktoberfest, and we wanted to give everyone ample time to collaborate with our engineering team. If you were able to merge your PRs during October, amazing. If it’s still not merged, don’t worry about it either. Either way, we’ve got your Hacktoberfest swag minted and ready to ship.

Please comment with your Discord username here so we can contact you about your shipping information to deliver your Hacktoberfest swag.

Discord username: _kit_t

Thanks!

[gewenyu99]

Will reach out soon after we put together forms for everyone!