[22873] Setup ROS 2 Easy Mode at participant creation

[Carlosespicur]

Description

This PR adds support for manually configuring ROS 2 Easy Mode using easy_mode_ip in RTPSParticipantAttributes. If the Easy Mode IP is manually configured, the value of the ROS2_EASY_MODE environment variable is ignored.

This PR depends on

• [22872] Configure ROS 2 Easy Mode via C++ and XML #5689

and must be merged after that one.

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)
• Changes are backport compatible: they do NOT break ABI nor change library core behavior.
• Changes are API compatible.
• 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: [22873] Setup ROS 2 Easy Mode at participant creation Fast-DDS-docs#1045
• 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.
• N/A If this is a critical bug fix, backports to the critical-only supported branches have been requested.
• Check CI results: changes do not issue any warning.
• Check CI results: failing tests are unrelated with the changes.

[juanlofer-eprosima]

LGTM, but before merging we should consider if this should have a backport to 3.2.0, as there might be ABI break in createParticipant.