Add support for Apple APNS AuthKey

[enahum]

Summary

This PR adds support for Apple AuthKey with this we will be using the same key for all Apple topics (one per-app) which means that the same key will WORK with every app we ship, also this removes the need to having to renew certificates every year. Also for customers the setup for APN is going to be much easier than the current certificate conversion to PEM.

Ticket Link

N/A

[github-actions]

Unit Test Results

  1 files  ±0    5 suites  ±0   16s ⏱️ ±0s
18 tests ±0  18 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 5895656. ± Comparison against base commit be6dd11.

♻️ This comment has been updated with latest results.

[agnivade]

Looking great Elias. Just some small suggestions.

[agnivade]

Superb work 👌

[enahum]

@spirosoik friendly reminder to review

[spirosoik]

great work thanks @enahum

[enahum]

@spirosoik @stylianosrigas the current apple certificate will expire in the next 30 days, this PR has been sitting here for a long while now, I'll be back from PTO on the 14th of April, can we coordinate so that this PR gets merged and deployed to our HPNS and TPNS as well as start using the API keys instead of the certs. The benefit of doing that is that we won't need to deploy updated certs every year.

The one downside would be that we would need to rotate the API in case there is a security breach of some sort.

Note: The previous method of using the cert is still valid after this PR gets merged and deployed

[stylianosrigas]

@enahum Sounds good to me. Once we merge and cut a release, SRE Team can work on updating the Push Proxy helm chart and deploy where needed in cloud.

[spirosoik]

@enahum is security team aware for this change?

cc @iyampaul @DSchalla

[iyampaul]

@enahum is security team aware for this change?

cc @iyampaul @DSchalla

News to me, but I have no issues with this change 👍