Remove custom debugging functions

[mdeitersen]

Closes #7

• Seperated subtree managing logic from DebugManager and put it into its own class
• DebugManager now only has the purpose to collect node diagnostic data. Removed all other functionalities.

The following has to be adapted in the interface:

• DebugInfo.msg is replaced by SubtreeInfo.msg to publish the subtree states
• SetExecutionMode.srv and DebugSettings.msg to define the settings for recording node diagnostics and publishing subtrees are replaced by the services ~/debug/set_collect_node_diagnostics and ~/debug/set_publish_subtrees services

Closes #9

• added missing copyright headers

[codecov-commenter]

Codecov Report

Attention: 94 lines in your changes are missing coverage. Please review.

Comparison is base (870f4a2) 32.91% compared to head (b5e72f4) 33.01%.

Files	Patch %	Lines
ros_bt_py/src/ros_bt_py/tree_manager.py	9.09%	40 Missing ⚠️
ros_bt_py/src/ros_bt_py/debug_manager.py	13.33%	39 Missing ⚠️
ros_bt_py/src/ros_bt_py/ros_nodes/subtree.py	9.09%	10 Missing ⚠️
ros_bt_py/src/ros_bt_py/tree_node.py	37.50%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #50      +/-   ##
==========================================
+ Coverage   32.91%   33.01%   +0.09%     
==========================================
  Files          37       38       +1     
  Lines        5398     5352      -46     
  Branches     1248     1229      -19     
==========================================
- Hits         1777     1767      -10     
+ Misses       3553     3519      -34     
+ Partials       68       66       -2     

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