Add tensorboard support for segmentation metrics.

[Abdul-Mukit]

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• I have searched the RF-DETR issues and found no similar feature requests.

Description

While training RFDETRSegPreview, the plots in tensorboard still only contain metrics related to BBox. Plots of segmentation metrics are missing.
In order to support this, the class MetricsTensorBoardSink needs to be enhanced.

Expected behavior when training segmentation models:

Use case

Tensorboard logging of the mask metrics is needed to track and monitor experiments.

Additional

No response

Are you willing to submit a PR?

• Yes I'd like to help by submitting a PR!