Implement Google Nearby based Meshrabiya virtual network

[mikedawson]

Implement support for using Google Nearby as a transport layer for Meshrabiya:

• @mikedawson design interfaces for abstract transports
• @Prashant-Android Implement support for sending UDP packet as a byte Payload
• @Prashant-Android Implement support for using nearby Streams
• @Prashant-Android Implement chat using UDP
• @mikedawson refactor to use abstract interfaces for current implementation
• @Prashant-Android to update dependencies to match versions used in Ustad. Also convert to using libs.versions.toml like ustad, not variables in Gradle build file.

[mikedawson]

As per @Prashant-Android - chat is working using DatagramSocket. Dependencies are updated.

[mikedawson]

Reworked the Nearby implementation as envisioned. This fixed discovery collision / reliability issues (two nodes discovering each other at the same time both trying to connect at the same time).

Implementation now discovers nodes as expected using Nearby, checking ping times works as expected, and lost nodes are handled as expected.