[pylibs][ot-rfsim] enable CoAP-block and CoAP-observe; add CoAP-observe case study

[EskoDijk]

DRAFT PR
This enables CoAP-block and CoAP-observe in the CLI. It adds a case study for CoAP-observe to help in debugging.

[gemini-code-assist]

Summary of Changes

Hello @EskoDijk, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request integrates advanced CoAP features, specifically CoAP-block and CoAP-observe, into the system's command-line interface. It also introduces a practical case study to illustrate the usage and aid in debugging the CoAP-observe functionality, providing a clear example of a client monitoring resource changes on a server.

Highlights

• CoAP Feature Enablement: The pull request enables CoAP-block and CoAP-observe functionalities within the CLI by updating the build script to include these options.
• CoAP-observe Case Study: A new Python script, 'coap_observe.py', has been added to demonstrate and debug the CoAP-observe feature, simulating a client observing a server resource and reacting to its changes.

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[gemini-code-assist]

Code Review

This pull request enables CoAP-block and CoAP-observe features in the build script and adds a new case study for CoAP-observe. The changes to the build script are correct. The new case study provides a good example of the CoAP observe functionality, simulating a client observing a resource on a server that gets updated over time. I have one suggestion to improve the clarity of the new Python script.