Description

This PR implements the Fast DDS Auto Discovery Server Mode feature in Fast DDS.

• It updates the RTPSDomain to parse the new environment variable EASY_MODE and properly configure the RTPSParticipant to point to a local UDP Discovery Server.
• It adds a new builtin transport: P2P, targeting the new mode. It instantiates TCP and SHM transport for user data and UDP for metatrafficUnicast, relying on a Discovery Server for discovery purposes.
• It add a new class SystemCommandBuilder to build and make system calls within Fast DDS.

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
• Any new/modified methods have been properly documented using Doxygen.
• 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.
• 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.
• 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.
• 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.