Add vda5050 safety state msg (backport #266)

[mergify]

This PR introduces a new message definition: VDA5050SafetyState.

VDA5050SafetyState provides a standardized message for reporting the safety state of a robot or AGV in accordance with the VDA5050 schema. The fields and enumerations in this message are directly derived from the official VDA5050 specification to ensure compatibility with VDA5050-compliant fleet management systems and controllers.

While this message already exists in the ipa320/vda5050_msgs package, it is being added to control_msgs to:

• Enable direct integration with the upcoming vda5050_safety_state_broadcaster in ros2_controllers, and

• Ensure that the message is maintained and versioned alongside other core control interfaces.

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This is an automatic backport of pull request #266 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 6cd40a5 has failed:

On branch mergify/bp/jazzy/pr-266
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Changes to be committed:
	new file:   control_msgs/msg/VDA5050SafetyState.msg

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   control_msgs/CMakeLists.txt

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