[dev] Add TaskThread Qt debugging

[Alxiice]

Description

This PR adds a way to debug TaskThread.
Before this PR we cannot add a breakpoint on a TaskThread.

Content of the PR

If a DEBUGGING env var is set to True we enable the debugging on the task thread

How to use

In VSCode this launch.json can be used

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Meshroom",
            "type": "debugpy",
            "request": "launch",
            "program": "meshroom/ui",
            "console": "integratedTerminal",
            "env": {
                // "MESHROOM_NODES_PATH": "${workspaceFolder}/tests/nodes",
                // "MESHROOM_PLUGINS_PATH": "/path/to/plugins",
                "MESHROOM_OUTPUT_QML_WARNINGS": "1",
                "MESHROOM_QML_DEBUG": "0",
                "MESHROOM_QML_DEBUG_PARAMS": "port:7789",
                "DEBUGGING": "1",
            },
            "args": [
                "/path/to/scene.mg"
            ],
            "subProcess": true,
        }
  }

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.38%. Comparing base (9ccb5e5) to head (a39d3a1).
⚠️ Report is 33 commits behind head on develop.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3038      +/-   ##
===========================================
+ Coverage    83.05%   83.38%   +0.32%     
===========================================
  Files           72       73       +1     
  Lines         9657     9874     +217     
===========================================
+ Hits          8021     8233     +212     
- Misses        1636     1641       +5     

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