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/processor_factory.h

@@ -0,0 +1,36 @@
+#ifndef PROCESSOR_FACTORY_H
+#define PROCESSOR_FACTORY_H
+
+#include <functional>
+#include <memory>
+#include <unordered_map>
+
+#include "processor.h"
+
+// Processor Factory Class
+class ProcessorFactory {
+   public:
+    using Creator = std::function<std::unique_ptr<Processor>(const ProcessorConfig *, uint32_t)>;
+
+    // Singleton instance accessor
+    static ProcessorFactory &instance();
+
+    // Register a processor type with its creation function
+    void register_processor(ProcessorType type, Creator creator);
+
+    // Create a processor instance based on configuration
+    std::unique_ptr<Processor>
+    create_processor(const ProcessorConfig *processor_config, uint32_t vk_device_index) const;
+
+   private:
+    // Private constructor for Singleton
+    ProcessorFactory() = default;
+
+    // Map of processor types to their creation functions
+    std::unordered_map<ProcessorType, Creator> creators;
+
+    // Static initializer for default processors
+    static void init_default_processors(ProcessorFactory &factory);
+};
+
+#endif  // PROCESSOR_FACTORY_H