feat: make ImageSerializer internal

Author: mackoj

Sources/SnapshotTesting/Plugins/ImageSerializer.swift

@@ -13,12 +13,12 @@ import AppKit
 /// The `ImageSerializer` class leverages plugins that conform to the `ImageSerialization` protocol to encode and decode images in different formats.
 /// It automatically retrieves all available image serialization plugins from the `PluginRegistry` and uses them based on the specified `ImageSerializationFormat`.
 /// If no plugin is found for the requested format, it defaults to using PNG encoding/decoding.
-public class ImageSerializer {
+class ImageSerializer {
 
   /// A collection of plugins that conform to the `ImageSerialization` protocol.
-  let plugins: [ImageSerialization]
+  private let plugins: [ImageSerialization]
 
-  public init() {
+  init() {
     self.plugins = PluginRegistry.allPlugins()
   }
 
@@ -32,7 +32,7 @@ public class ImageSerializer {
   ///   - image: The `SnapImage` to encode.
   ///   - imageFormat: The format in which to encode the image.
   /// - Returns: The encoded image data, or `nil` if encoding fails.
-  public func encodeImage(_ image: SnapImage, imageFormat: ImageSerializationFormat = .defaultValue) -> Data? {
+  func encodeImage(_ image: SnapImage, imageFormat: ImageSerializationFormat = .defaultValue) -> Data? {
     for plugin in self.plugins  {
       if type(of: plugin).imageFormat == imageFormat {
         return plugin.encodeImage(image)
@@ -52,7 +52,7 @@ public class ImageSerializer {
   ///   - data: The image data to decode.
   ///   - imageFormat: The format in which the image data is encoded.
   /// - Returns: The decoded `SnapImage`, or `nil` if decoding fails.
-  public func decodeImage(_ data: Data, imageFormat: ImageSerializationFormat = .defaultValue) -> SnapImage? {
+  func decodeImage(_ data: Data, imageFormat: ImageSerializationFormat = .defaultValue) -> SnapImage? {
     for plugin in self.plugins {
       if type(of: plugin).imageFormat == imageFormat {
         return plugin.decodeImage(data)