feat(system_diagnostic_graph): support config override and add tests

[isamu-takagi]

Description

• Add config override feature: This allows you to create a configuration with some modifications to an existing configuration.
• Add tests.
• Add warn remap.
• Add graph dump tool.

Related links

None

Tests performed

colcon test --packages-select system_diagnostic_graph --event-handlers=console_cohesion+

Notes for reviewers

You can see the structure of the graph with the following command.

ros2 run system_diagnostic_graph tool <graph_file_path>

Interface changes

None

Effects on system behavior

None

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After all checkboxes are checked, anyone who has write access can merge the PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (765a596) 15.32% compared to head (ad5d648) 39.71%.
Report is 179 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5816       +/-   ##
===========================================
+ Coverage   15.32%   39.71%   +24.39%     
===========================================
  Files        1721       14     -1707     
  Lines      118559      637   -117922     
  Branches    37995      261    -37734     
===========================================
- Hits        18169      253    -17916     
+ Misses      79657      227    -79430     
+ Partials    20733      157    -20576     

Flag	Coverage Δ
differential	39.71% <ø> (?)
total	?

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[mkuri]

Confirmed to pass all tests.