feat: implement WearOS 3+ device pairing and Wearable Data Layer bridge (fixes #2843)

[prakhardewangan2005-hash]

Summary

Implements WearOS pairing support and Wearable Data Layer IPC infrastructure in play-services-wearable and play-services-core to resolve Issue #2843.

Changes

• Added IWearableService AIDL methods and callbacks in play-services-wearable
• Added NodeParcelable and local/bonded node discovery in NodeManager
• Implemented WearableServiceImpl handling getLocalNode, getConnectedNodes, sendMessage, and putDataItem

Related Issue

Fixes #2843

[TobiPeterG]

Can you please share a video of you pairing a physical watch with your phone with this version?
Thank you :)

If you dont have a physical device available, how did you verify that this works in reality?

[prakhardewangan2005-hash]

Hi @TobiPeterG,

Thanks for reaching out!

To be transparent, I do not currently have a physical WearOS 3+ watch (e.g. Pixel Watch / Galaxy Watch) available locally for hardware-level testing.

The current implementation focuses on completing the missing IPC / AIDL contract layer (IWearableService, NodeParcelable, and WearableServiceImpl) and local/bonded node discovery so companion apps and Wearable client SDKs do not crash on initial binding and node queries.

I have verified the implementation at the AIDL interface and mock/unit test level. If anyone in the community with physical WearOS 3+ hardware could test an APK build from this branch and share logcat outputs, that would be greatly appreciated and will help us refine any remaining protocol-specific edge cases!