Description

This PR isolate idl types with const/typedefs inside a struct

Contributor Checklist

• Commit messages follow the project guidelines.
• N/A Any new/modified type has been properly reflected on test/feature/dynamic_types/dds_types_tests tests in a Pull Request.
• Any new/modified type has been properly updated on test/dds/xtypes tests using update_header_and_create_cases.py script in a Pull Request.
• For any new IDL file, Fast DDS update_generated_code_from_idl.sh script adding a new line in file_needing_output_dir list in a Pull Request.

Reviewer Checklist

• N/A: The PR has a milestone assigned.
• The title and description correctly express the PR's purpose.
• Check contributor checklist is correct.