Add Netcore Email adapter

[codingmickey]

As I'm still yet to receive the test account and credits from Netcore I'm making this a draft PR, as I wrote the code and tests by referring to their API docs

What does this PR do?

This PR adds Netcore email adapter along with tests.

Test Plan

Check the first line I'll update once I get a Netcore account or if someone already has one test account that can be really helpful to test, As their email API doesn't include direct free testing account signups currently

Related PRs and Issues

Closes appwrite/appwrite#6394

• 💬 Improve Appwrite Messaging with Netcore Adapter appwrite/appwrite#6394

Have you read the Contributing Guidelines on issues?

Yes

[gewenyu99]

Hey,

Due to time constraints, I'm going to mark this PR hacktoberfest-accepted for now so you get DO's Hacktoberfest rewards. We'll continue to work with you on this issue for review and merge.

When it is merged, we'll contact you for Appwrite-specific Hacktoberfest swag.

Thanks for helping us improve Appwrite!

[codingmickey]

What would be the next process of getting merged.. as I still haven't been contacted by the Netcore team for a free trial account to test these :(

[gewenyu99]

@codingmickey Since the PR is approved, there is nothing more on your side. We will merge these PRs, nothing more required from you :D

[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.