New Request-Reply example [16607]

[richiware]

Description

This PR adds a new example to illustrate request-reply mechanism. Also it removes an obsolete client-server example.

Contributor Checklist

• Commit messages follow the project guidelines.
• The code follows the style guidelines of this project.
• N/A Tests that thoroughly check the new feature have been added/Regression tests checking the bug and its fix have been added.
• N/A Any new/modified methods have been properly documented using Doxygen.
• N/A Fast DDS test suite has been run locally.
• N/A Changes are ABI compatible.
• N/A Changes are API compatible.
• N/A Documentation builds and tests pass locally.
• N/A New feature has been added to the versions.md file (if applicable).
• New feature has been documented/Current behavior is correctly described in the documentation.

Related documentation PR: eProsima/Fast-DDS-docs#436

Reviewer Checklist

• Check contributor checklist is correct.
• Check CI results: changes do not issue any warning.
• Check CI results: failing tests are unrelated with the changes.

[JLBuenoLopez]

Please, review also the PR checklist and mark those that apply and mark as N/A those that does not. The policy is to not merge any PR which has pending tasks. Thanks in advance! 😉

[JLBuenoLopez]

LGTM