Contribute Smart Trailer Sample Applications

[ladatz]

Add the sample applications necessary for the smart trailer use case. This includes:

• Code necessary to connect to the in-vehicle stack
• Dockerfile to build a multi-platform image for the sample workloads
• digital twin model: The DTDL representation of the smart trailer with one property: the trailer's weight
• Digital Twin Providers:
  • Trailer Connected Provider: simulates the signal of the trailer being connected to the vehicle
  • Trailer Properties Provider: represents the properties of the trailer, for now only the weight property
• Smart Trailer Application: A simple application which consumes the trailer's weight property and logs it for now
• Dynamic Orchestration script: A script for each orchestrator (Ankaios and BlueChi) which listens for the trailer connected signal and when it is received, starts the properties provider and the smart trailer application. This showcases dynamic orchestration and can be replaced by applications in a future iteration

[eriksven]

First of all, sorry for keeping this PR open for a longer time. The PR uses MIT license while the project and the repository are licensed under Apache 2.0 license. I would like to avoid a situation where we have content under mixed licenses in this repository and therefore do not merge this PR. In #17 we discussed the same topic so I am waiting on a clarification there.

[eriksven]

I created an issue for the discussion around the used license and whether to change the used license for the whole repository to MIT: #23