feat(image_compressing): add image compressing func + integrated in diary

lib/core/image_compressing/image_compress_utility.dart

@@ -0,0 +1,45 @@
+import 'dart:io';
+import 'package:flutter_image_compress/flutter_image_compress.dart';
+import 'package:image/image.dart' as img;
+import 'package:path/path.dart' as p;
+
+abstract class ImageCompressUtility {
+  static Future<List<File>> compressFilesList(List<File> files) async {
+    final List<File> compressedFilesList = [];
+    for (int i = 0; i < files.length; i++) {
+      compressedFilesList.add(await compressFile(files[i]));
+    }
+    return compressedFilesList;
+  }
+
+  static Future<File> compressFile(File file) async {
+    final image = img.decodeImage(file.readAsBytesSync())!;
+    int width = image.width;
+    int height = image.height;
+
+    if (width > height) {
+      if (width > 1080) {
+        height = (height * 1080) ~/ width;
+        width = 1080;
+      }
+    } else {
+      if (height > 1080) {
+        width = (width * 1080) ~/ height;
+        height = 1080;
+      }
+    }
+
+    String filePathWithoutExtension = p.withoutExtension(file.path);
+    String compressedFilePath = '${filePathWithoutExtension}_compressed.jpg';
+
+    final result = await FlutterImageCompress.compressAndGetFile(
+      file.absolute.path,
+      compressedFilePath,
+      quality: 90,
+      minHeight: height,
+      minWidth: width,
+    );
+
+    return File(result!.path);
+  }
+}