Add snakeCase JSON encoder and decoder for convenience

Sources/HandySwift/Extensions/JSONDecoderExt.swift

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+import Foundation
+
+extension JSONDecoder {
+   /// A pre-configured JSONDecoder that automatically converts snake_case JSON property names
+   /// to camelCase when decoding into Swift types
+   ///
+   /// This decoder handles incoming JSON with snake_case keys and converts them to match
+   /// Swift's camelCase property naming convention.
+   ///
+   /// Example usage:
+   /// ```
+   /// let jsonString = """
+   /// {
+   ///     "first_name": "John",
+   ///     "last_name": "Doe"
+   /// }
+   /// """
+   /// let user = try JSONDecoder.snakeCase.decode(User.self, from: jsonData)
+   /// // Results in: User(firstName: "John", lastName: "Doe")
+   /// ```
+   static var snakeCase: JSONDecoder {
+      let decoder = JSONDecoder()
+      decoder.keyDecodingStrategy = .convertFromSnakeCase
+      return decoder
+   }
+}

Sources/HandySwift/Extensions/JSONEncoderExt.swift

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+import Foundation
+
+extension JSONEncoder {
+   /// A pre-configured JSONEncoder that automatically converts Swift's camelCase property names
+   /// to snake_case when encoding JSON
+   ///
+   /// Instead of creating a new encoder and configuring it each time, this provides a ready-to-use
+   /// encoder with snake_case conversion.
+   ///
+   /// Example usage:
+   /// ```
+   /// let user = User(firstName: "John", lastName: "Doe")
+   /// let jsonData = try JSONEncoder.snakeCase.encode(user)
+   /// // Results in: {"first_name": "John", "last_name": "Doe"}
+   /// ```
+   static var snakeCase: JSONEncoder {
+      let encoder = JSONEncoder()
+      encoder.keyEncodingStrategy = .convertToSnakeCase
+      return encoder
+   }
+}