Enhance error handling: implement user-friendly error messages for common issues

[albertpod]

Julia's stacktraces are often difficult to parse, leading to user frustration when debugging RxInfer.

Proposal

Following on @fonsp suggestion, we should create a system to catch common errors and display helpful messages like:

We noticed you encountered an error that typically occurs when [specific condition].
Don't worry - this is a common issue that can be resolved!
📚 First, check our documentation at:
`https://reactivebayes.github.io/RxInfer.jl/stable/`
💬 If you can't find what you need, please open a discussion at:
`https://github.com/orgs/ReactiveBayes/discussions`
We're here to help make your experience with RxInfer better!

Implementation

• Identify and catch common error patterns
• Replace stacktraces with friendly messages
• Direct users to documentation and discussions

[bvdmitri]

Fixed in #391