Adding dynamic data enum example

[angelrti]

Summary

This PR adds an example that shows how to use DynamicData Enums and get their member ordinal values by name (string).

Checks

• [X] I have updated the documentation accordingly.
• [X] I have read the CONTRIBUTING document.

• [X] I have added a new C/C++ example and updated examples/connext_dds/CMakeList.txt accordingly.

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Everything is OK. Thank you for the PR!

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Everything is OK. Thank you for the PR!

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The compilation is starting. Take a look here.

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Everything is OK. Thank you for the PR!

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Everything is OK. Thank you for the PR!

[alexcamposruiz]

This looks like a really granular and small example. I don't think it makes sense to create a brand new example instead of adding the relevant code to the documentation, the KB, or incorporating it into an existing example.