[21099] X-Types examples

[EduPonz]

Description

This PR adds an X-Types example in which a type is defined in run-time at the publisher side using the Dynamic Types API, and the subscriber discovers the type, creates a reader for it, and prints the received data.
This example is type compatible with the hello_world one (a compatibility test has been added for this).

This PR depends on:

• TypeObjectRegistry refactor [21132] #4874

Contributor Checklist

• Commit messages follow the project guidelines.
• The code follows the style guidelines of this project.
• Tests that thoroughly check the new feature have been added/Regression tests checking the bug and its fix have been added; the added tests pass locally
• N/A: Any new/modified methods have been properly documented using Doxygen.
• N/A: Any new configuration API has an equivalent XML API (with the corresponding XSD extension)
• N/A: Changes are backport compatible: they do NOT break ABI nor change library core behavior.
• N/A: Changes are API compatible.
• New feature has been added to the versions.md file (if applicable).
• N/A: New feature has been documented/Current behavior is correctly described in the documentation.
• N/A: Applicable backports have been included in the description.

Reviewer Checklist

• The PR has a milestone assigned.
• The title and description correctly express the PR's purpose.
• Check contributor checklist is correct.
• Check CI results: changes do not issue any warning.
• Check CI results: failing tests are unrelated with the changes.

[Mario-DL]

Very meaningful example ! Leaving two NITs and a suggestion.
It seems that ShapesDemo Types should be regenerated in order to get Ubuntu CI running again

[Mario-DL]

LGTM with green CI