Support training loop for improving auto labeling models

[vietanhdev]

Labeling -> Training -> Autolabeling -> Correction -> Training -> Autolabeling.... Support loading a custom model.

[vietanhdev]

From AnyLabeling v0.2.22, to load custom models:

• Download models from here, extract.
• Load the models with Custom Models feature: https://anylabeling.com/docs/custom-models.