perf: improve vectorization optimizations and add function multi-versioning (#1271)

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

src/avutils.cpp

@@ -135,6 +135,7 @@ AVPixelFormat get_encoder_default_pix_fmt(const AVCodec *encoder, AVPixelFormat
     return best_pix_fmt;
 }
 
+[[gnu::target_clones("default", "avx2", "avx512f")]]
 float get_frame_diff(AVFrame *frame1, AVFrame *frame2) {
     if (!frame1 || !frame2) {
         logger()->error("Invalid frame(s) provided for comparison");