feat(rife): add support for frame interpolation and RIFE (#1244)

* feat: add RIFE files and processor/interpolator abstractions
* feat: add `rife` as processor option
* feat: add frame interpolation math except first frame
* feat: complete motion interpolation and add scene detection
* feat: improve Vulkan device validation
* fix: fix casting issues and variable names
* refactor: improve error-checking; add abstractions and factories
* refactor: improve readability of the frames processor
* docs: update changelog

Signed-off-by: k4yt3x <i@k4yt3x.com>

include/libvideo2x/frames_processor.h

@@ -0,0 +1,19 @@
+#ifndef FRAMES_PROCESSOR_H
+#define FRAMES_PROCESSOR_H
+
+#include "decoder.h"
+#include "encoder.h"
+#include "libvideo2x.h"
+#include "processor.h"
+
+int process_frames(
+    const EncoderConfig *encoder_config,
+    const ProcessorConfig *processor_config,
+    VideoProcessingContext *proc_ctx,
+    Decoder &decoder,
+    Encoder &encoder,
+    Processor *processor,
+    bool benchmark = false
+);
+
+#endif  // FRAMES_PROCESSOR_H