Use UUIDs for BTNodes

[Doomse]

Identify nodes and trees using uuids, meaning names don't have to be unique anymore.

This is related to https://github.com/fzi-forschungszentrum-informatik/ros2_ros_bt_py_web_gui/pull/38

[codecov-commenter]

Codecov Report

:x: Patch coverage is 16.19217% with 471 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 33.53%. Comparing base (d577de9) to head (a7f148d).

Files with missing lines	Patch %	Lines
ros_bt_py/ros_bt_py/tree_manager.py	3.12%	243 Missing and 5 partials :warning:
ros_bt_py/ros_bt_py/migrate_tree_files.py	14.56%	129 Missing :warning:
ros_bt_py/ros_bt_py/node.py	12.12%	57 Missing and 1 partial :warning:
ros_bt_py/ros_bt_py/ros_nodes/subtree.py	18.18%	18 Missing :warning:
ros_bt_py/ros_bt_py/subtree_manager.py	71.42%	8 Missing and 4 partials :warning:
ros_bt_py/ros_bt_py/ros_helpers.py	80.00%	2 Missing :warning:
ros_bt_py/ros_bt_py/custom_types.py	66.66%	1 Missing :warning:
ros_bt_py/ros_bt_py/node_data.py	0.00%	0 Missing and 1 partial :warning:
ros_bt_py/ros_bt_py/nodes/fallback.py	0.00%	1 Missing :warning:
ros_bt_py/ros_bt_py/package_manager.py	66.66%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #211      +/-   ##
==========================================
- Coverage   34.38%   33.53%   -0.85%     
==========================================
  Files          40       41       +1     
  Lines        6719     7026     +307     
  Branches     1671     1751      +80     
==========================================
+ Hits         2310     2356      +46     
- Misses       4288     4541     +253     
- Partials      121      129       +8     

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