Adding uid to log msg

[ct2034]

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Basic Info

Info	Please fill out this column
Ticket(s) this addresses	None
Primary OS tested on	Ubunut
Robotic platform tested on	Gazebo

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Description of contribution in a few bullet points

• Added uid file to BehaviorTreeStatusChange.msg
• Populate field in logger
• I use this information in https://github.com/boschresearch/bt_tools#bt_live

Description of documentation updates required from your changes

None

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Future work that may be required in bullet points

None

For Maintainers:

• Check that any new parameters added are updated in navigation.ros.org
• Check that any significant change is added to the migration guide
• Check that any new features OR changes to existing behaviors are reflected in the tuning guide
• Check that any new functions have Doxygen added
• Check that any new features have test coverage
• Check that any new plugins is added to the plugins page
• If BT Node, Additionally: add to BT's XML index of nodes for groot, BT package's readme table, and BT library lists