Add rust-sensors app

[Mallets]

This is a no frills Rust app that mimics the periodic update and observation of sensor data.

The goal is to focus the app on the basic usage of the Ditto SDK without all the noise usually introduced by integrating the Distto SDK with external frameworks. This would allow new users to focus directly on how to use the Ditto SDK.

The app needs to be configured in the same way as https://docs.ditto.live/sdk/latest/quickstarts/rust-console w.r.t. Ditto Credentials. So the same doc applies.

To see the app in action is sufficient to run multiple instances of the app in different terminals, e.g.:

cargo run -- --id kitchen

cargo run -- --id bedroom

[phatblat]

@Mallets This looks handy, but I'm not sure this quickstart repo is the best home for this app. These apps go along with companion docs which help users get Ditto up and running quickly with real code and see Ditto in action.

All the apps share the same data model and have similar UI - although these vary between native GUI, TUI and web interfaces.

This app uses a sensors collection with Sample documents inserted as the sensor produces measurements. This seems like it might be better in its own repo with some explanation on how to set it up an connect a sensor.

Was this built to show a customer or just something you came up with?

[Mallets]

This is the result of the discussion in https://dittolive.slack.com/archives/CND00ECK0/p1749647553863099 and https://dittolive.slack.com/archives/CGDF7RN3C/p1749736216102929.

TL;DR:

• As part of my on-boarding I went through the exercise of building a simple app as a quickstart (not building a full demo app)
• I provided feedback to #docs and was asked to contribute it
• @cameron1024 seems to have have ported the app to the new data model (see slack) but I'm not sure where it is.

I don't have anything against closing this PR as it is.
It was really part of a feedback cycle and contribution request.