Improve code structure

- Add separate API project
- Add notification system

HyperbolicDownloaderApi/FileProcessing/FileCompressor.cs

@@ -0,0 +1,33 @@
+using System.IO.Compression;
+
+namespace HyperbolicDownloaderApi.FileProcessing;
+
+internal static class FileCompressor
+{
+    public static void CompressFile(string inputFilePath, string compressedFilePath)
+    {
+        using FileStream originalFileStream = File.Open(inputFilePath, FileMode.Open);
+        using FileStream compressedFileStream = File.Create(compressedFilePath);
+        using GZipStream? compressor = new GZipStream(compressedFileStream, CompressionMode.Compress);
+        originalFileStream.CopyTo(compressor);
+    }
+
+    public static void DecompressFile(string compressedFilePath, string outputFilePath)
+    {
+        using FileStream compressedFileStream = File.Open(compressedFilePath, FileMode.Open);
+        using FileStream outputFileStream = File.Create(outputFilePath);
+        using GZipStream? decompressor = new GZipStream(compressedFileStream, CompressionMode.Decompress);
+        decompressor.CopyTo(outputFileStream);
+    }
+
+    public static IEnumerable<byte[]> ReadChunks(string path, int chunkSize)
+    {
+        byte[] buffer = new byte[chunkSize];
+        using FileStream fs = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.Read);
+        using BufferedStream bs = new BufferedStream(fs);
+        while (bs.Read(buffer, 0, chunkSize) != 0)
+        {
+            yield return buffer;
+        }
+    }
+}