Extract the mean average precision of both bbox and segm simultaneously in one run

[vsuryamurthy]

🚀 Feature

In the current implementaion, one has to initialize MeanAveragePrecision() twice to get bbox and segmentation results. The implementation should support getting both bbox and segmentation metrics with a single initialization.

Motivation

The pytorch evaluation has the possibility to get both bbox and segmentation mAP in one run. This implementation has been out for a while now and I believe we should have a similar behaviour!

Pitch

Rather than taking a Literal of either a bbox or segm, the input argument iou_types (instead of iou_type) should take a list instead. The returned value should Dict but with first key being the iou_type.

Please let me know what you think!

[github-actions]

Hi! thanks for your contribution!, great first issue!