`DataPack` image getter and setting function

[hepengfe]

Is your feature request related to a problem? Please describe. Currently, we don't have DataPack.set_image() that can simplify the DataPack API to set image payload cache data.

Describe the solution you'd like

• DataPack.set_image() that takes image data and set the cache data of image payload at the specified index.
• DataPack.image that getting image data from ImagePayload

Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered.

Additional context Add any other context or screenshots about the feature request here.