fix(ci): ensure all examples compile with the specified feature-set

[thomaseizinger]

Description

Due to cargo's feature unification, a full build of our workspace doesn't actually check whether the examples compile as standalone projects.

We add a new CI check that iterates through all crates in the examples/ directory and runs a plain cargo check on them. Any failure is bubbled up via set -e, thus failing CI in case one of the cargo check commands fails.

To fix the current failures, we construct a simple TCP transport everywhere where we were previously using development_transport. That is because development_transport requires mplex which is now deprecated.

Related #3657.
Related #3809.

Open tasks

• Open a GitHub mgmt repository PR to make this mandatory once it is merged.

Change checklist

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• A changelog entry has been made in the appropriate crates