[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

❌ Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.38%. Comparing base (1628f7a) to head (c205bec).
⚠️ Report is 4 commits behind head on develop.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
meshroom/core/attribute.py	40.00%	3 Missing ⚠️

❌ Your patch status has failed because the patch coverage (40.00%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3038      +/-   ##
===========================================
- Coverage    83.40%   83.38%   -0.03%     
===========================================
  Files           73       73              
  Lines         9870     9874       +4     
===========================================
+ Hits          8232     8233       +1     
- Misses        1638     1641       +3     

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