AY-7442 Add SXR support for plate, render and image simple publishers.

[robin-ynput]

Changelog Description

resolve: ynput/ayon-nuke#69

Changes:

• Add SXR image extension support for plate, render and image simple creators.
• Ensure SXR extension is properly validated by validate_frame_range plugin

Additional review information

Needs to be tested with: ynput/ayon-core#1165

Testing notes:

1. Download this SXR material
2. Publish this material as image, render or plate through the simple creators
3. Gather resulting material in Nuke as image and/or clip

[iLLiCiTiT]

I think this will require to add .sxr to IMAGE_EXTENSIONS in ayon-core too https://github.com/ynput/ayon-core/blob/develop/client/ayon_core/lib/transcoding.py#L47

[jakubjezek001]

I think this will require to add .sxr to IMAGE_EXTENSIONS in ayon-core too ynput/ayon-core@develop/client/ayon_core/lib/transcoding.py#L47

already done here https://github.com/ynput/ayon-core/pull/1165/files