v15.13.rtx: experimental TensorRT-RTX backend

This is a pre-release for the experimental TRT_RTX backend.

TRT-RTX

• Upgraded to TensorRT-RTX 1.1.

vsmlrt.py

• Added support for ArtCNN R16F96 Chroma model.
• Added output_format parameter to non-cuda ort backends.
• Added fp16 I/O support for the TRT_RTX backend.

Community contributions

• Remove extraneous plugin check for RIFE by @Rukario in #135

Known issues

• fp16 inference for RIFE v2 and SAFA models is currently not supported in the TRT_RTX backend.

Full Changelog: v15.13...v15.13.rtx