Add large data to Advanced config example

[elianalf]

Description

This pr adds the possibility to send large data with the advanced configuration example. The user can define the size of the message that is sent.

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; the added tests pass locally
• Any new/modified methods have been properly documented using Doxygen.
• Changes are ABI compatible.
• Changes are API compatible.
• N/A 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.

[EduPonz]

I think we should state in the readme of the example that due to the sequence in the data type this example will not use data sharing

[EduPonz]

@richiprosima please test this

[elianalf]

@richiprosima please test mac

[elianalf]

@richiprosima please test mac