Add Push Notification with Play Service on generic flavor (full FLOSS)

[p1gp1g]

This PR is based on #5883, it is marked as draft until the previous PR is merged

It adds a component, FCM embedded UnifiedPush distributor, that allows to get push notifications with the Play Services, without using firebase-messaging, and the proprietary libs. It is therefore compatible with F-Droid inclusion.

It gives Play Services notifications with web push requests: so the notification proxy, isn't used

🏁 Checklist

• ⛑️ Tests (unit and/or integration) are included or not needed
• 🔖 Capability is checked or not needed
• 🔙 Backport requests are created or not needed: /backport to stable-xx.x
• 📅 Milestone is set
• 🌸 PR title is meaningful (if it should be in the changelog: is it meaningful to users?)

[mahibi]

Thank you so much @p1gp1g i'm really looking forward to have UnifiedPush implemented 👍 👍 👍
We will take a close look as soon as time allows, it might not be this week though.

[mahibi]

i won't find the time this week. It's on my list though

[mahibi]

It's not forgotten. Will come back

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[mahibi]

@p1gp1g please excuse the delay, we will have a closer look soon.
Are you willing to fix the merge conflicts?

[mahibi]

Hi @p1gp1g
due to upcoming vacations in plan to review this PR in CW16.

[mahibi]

I'm back. Planning to have a look this week

[p1gp1g]

OK, I'm resolving conflicts then 👍

[p1gp1g]

#5883 and this PR are rebased

[mahibi]

assigned myself just to keep an overview

[mahibi]

Please excuse the current delays in pull request reviews.
The PR is on our list.

[AndyScherzinger]

@p1gp1g despite the rebase it shows 3 conflicted files, did you rebase to latest main branch of Nextcloud or your remote?

[p1gp1g]

I rebased on my unifiedpush branch which got merged. I'm rebasing to the master branch to fix the conflicts - I've also a commit to sign

[p1gp1g]

I'm taking time, because I'm updating the library in the same time

[p1gp1g]

OK, it's done now 👍

[mahibi]

We are now trying to catch up with the pull request reviews. The PR is not forgotten and should be picked up soon.

[mahibi]

Apologies for the delay, i was out sick for a week and now try to catch up

[p1gp1g]

No problem. I hope you're getting better 👍

[mahibi]

Review is planned for this week

[mahibi]

still on my list..

[mahibi]

planning it again for this week ;)

[mahibi]

As always, great work @p1gp1g 🥇
Please excuse the long delay, it depended on internal discussions.

When the suggestions are implemented and it's rebased on master we should be ready to merge.

[p1gp1g]

I think I've resolved all your comments!

[mahibi]

I think I've resolved all your comments!

👍 could you sync with the origin repo and rebase on the latest changes?

[p1gp1g]

The PR is rebased

[p1gp1g]

I've pushed again after a lint

[mahibi]

Thank you @p1gp1g , great job 👍

[p1gp1g]

Great! It’s really nice to see that the contributions are well received 👍