feat: 🚀 Keypoint support for detectron2

[onuralpszr]

Description

This PR adds support for keypoints support for detectron2 model

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How has this change been tested, please provide a testcase or example of how you tested the change?

https://colab.research.google.com/drive/19nA7-MZQbPPMhtBbpMEpmRcpemwqSatJ?usp=sharing

Docs

• Docs updated? What were the changes:

[LinasKo]

I ran the colab with im = np.zeros((640, 640, 3), dtype=np.uint8).

The from_detectron2 function threw this error:
ValueError: xy must be a 2D np.ndarray with shape ((0, 0),), but got shape (0, 17, 2).

Could you look into that?

[onuralpszr]

I ran the colab with im = np.zeros((640, 640, 3), dtype=np.uint8).

The from_detectron2 function threw this error: ValueError: xy must be a 2D np.ndarray with shape ((0, 0),), but got shape (0, 17, 2).

Could you look into that?

Sure let me check it. I didn't see this comment ( missed or didn't get notify from email or github at mobile sorry)

[onuralpszr]

@LinasKo empty case fixed. sorry for late response legit did not see it.

[LinasKo]

There are small imperfections with the Colab, but overall it looks good!

Thank you @onuralpszr!