Apply client workspace compatibility patches for newer ROS 2 interface packages

[EugenioCollado]

This PR adds compatibility patching in micro_ros_setup for imported ROS 2 client workspaces so they can be built successfully with Micro XRCE-DDS typesupport.

Recent ROS 2 interface packages use patterns that work in a full ROS 2 build but can break in the micro-ROS firmware workspace. In particular:

• some foundational interface packages use rosidl_core_generators, which prevents the Micro XRCE-DDS generators from producing the required typesupport for downstream action-related dependencies in this environment
• some action-containing interface packages do not explicitly declare the dependencies that become relevant once Micro XRCE-DDS typesupport is generated and linked in the firmware workspace

This PR keeps those fixes local to micro-ROS by shipping patch files in micro_ros_setup and applying them when the workspace is created/imported, instead of requiring direct changes in upstream ROS 2 repositories as part of the normal micro-ROS flow.

What changed

• Add patch assets for imported ROS 2 packages
• Apply those patches from the workspace creation flow
• Cover the interface packages needed for successful Micro XRCE-DDS client firmware builds

Patch scope

The compatibility patches address:

• switching selected interface packages from rosidl_core_generators to rosidl_default_generators
• updating matching runtime dependencies where needed
• adding explicit action-related dependencies in packages that otherwise resolve incorrectly in the micro-ROS workspace

Why
As a micro-ROS maintainer, we need the fix to live in micro-ROS-owned repositories while still allowing the generated firmware workspace to build against current ROS 2 interface definitions.

[Copilot]

Pull request overview

Adds a patching step to the micro_ros_setup client workspace import flow so newer ROS 2 interface packages can be made compatible with Micro XRCE-DDS typesupport generation/linking, without requiring upstream ROS 2 repo changes.

Changes:

• Introduce a new apply_patches.sh script and invoke it during create_ws.sh.
• Add patch assets under patches/ for generator/runtime and action-dependency compatibility fixes.
• Install the patch assets and the new script via CMake.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
scripts/create_ws.sh	Calls the patch-application step after importing repositories.
scripts/apply_patches.sh	New helper to locate patch assets and apply them idempotently to a workspace.
patches/ros2-test-msgs-action-deps.patch	Patch asset adding action-related deps for test_msgs.
patches/ros2-example-interfaces-action-deps.patch	Patch asset adding action-related deps for example_interfaces.
patches/ros2-core-generators-to-default-generators.patch	Patch asset switching selected interface packages from core to default generators/runtime.
CMakeLists.txt	Installs the patches/ directory and the new script.

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