feat: Add WearOS Support

[thehale]

⌚ Simple Time Tracker for WearOS

Adds a WearOS companion app to enable changing active activities from one's wrist.

Features:

• See available activities on the watch
  • Changing the available activities on the phone is reflected on the watch.
• See the currently running activity(ies) on the watch
  • Changing the running activities on the phone is reflected on the watch.
• Start a new activity on the watch.
• Choose a zero or more tags when starting an activity on the watch.
• Stop an activity from the watch.
• Follow app settings
  • Multi-tasking
  • Prompt for tags
  • Prompt for tags even when only general tags are available
  • Auto-start activity after selecting one tag vs. allow multiple selections

closes #60

https://github.com/Razeeman/Android-SimpleTimeTracker/assets/47901316/d2a9735d-880b-484d-8f57-419b4770c1e6

👀 Important Implementation Notes for Review

📲 Phone <-> ⌚ Wear Communication Protocol

Reliable communication between the phone and the watch can be tricky. Instead of puzzling over the code directly, I recommend first reading through the documentation of the protocol.

💥This PR drops support for Android versions < 8.0

WearOS requires at least a minSDK of 23 (Android 6.0). The libraries I used to implement the app require at least minSDK of 26 (Android 8.0).

This is a significant change from Simple Time Tracker's current support for devices as old as Android 5.0. We'll have to discuss the amount of backward compatibility we want to include after incorporating a WearOS app.

• Worth revisiting library selection to find tools that support back to Android 6.0?
• Create multiple builds of Simple Time Tracker? One without WearOS for Android 5.0-7.0, and another with WearOS for >=8.0?

According to Android Studio, here are the percent of active Android devices running at each API version as of today.

⚖️ MPL-2.0 Licensing

I would prefer to contribute my code under the terms of the MPL-2.0 license, which is fully compatible with the GPL-3.0 used in this repository.

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[!NOTE] This draft PR is almost ready, pending a few final code quality touch-ups.

Track progress towards production-readiness in the forked repository.

[thehale]

Tagging @Razeeman for a review since I'm not sure if GitHub sends notifications for Draft PRs.

[Razeeman]

Hello! Thank you very much for the help. Looks cool! Looking through the code.

[Razeeman]

Also if it is possible could you update thehale:wearos branch to the recent dev? Commit 9210757 should already be there and shoud not be shown here in the changes. To avoid git history pollution.

[Razeeman]

If you don't mind I would merge and start working on preparing the release. Other changes can be made in separate PRs if there would be any.

Your PR motivated me to buy a watch and it would super cool to see it in action. Thank you very much for implementing it.