Add initial implementations for encoder handling and conversion logic

Introduce encoder modules for various codecs and formats (e.g., h264_nvenc, libx264, libmp3lame). Add `Convertor` logic to retrieve supported formats via FFmpeg utilities and manage encoders for audio, video, and image processing.

internal/ffmpeg/encoder/qtrle/encoder.go

@@ -0,0 +1,21 @@
+package qtrle
+
+import (
+	"git.kor-elf.net/kor-elf/gui-for-ffmpeg/internal/ffmpeg/encoder"
+)
+
+func NewEncoder() encoder.EncoderContract {
+	parameters := map[string]encoder.ParameterContract{}
+	getParams := func(parameters map[string]encoder.ParameterContract) []string {
+		return []string{"-c:v", "qtrle"}
+	}
+
+	return encoder.NewEncoder("qtrle", parameters, getParams)
+}
+
+func NewData() encoder.EncoderDataContract {
+	title := "qtrle"
+	formats := []string{"mov"}
+	fileType := encoder.FileType(encoder.Video)
+	return encoder.NewData(title, formats, fileType, NewEncoder)
+}