feat/#95 :: Server에 Encodable Extension 추가

- 서버에서 사용되는 Encodable Extension을 추가했습니다

Co-Authored-By: Youngkyu Song <[email protected]>

PhotoGetherServer/PhotoGetherServer/Sources/App/Utils/Encodable+toData.swift

@@ -0,0 +1,7 @@
+import Foundation
+
+extension Encodable {
+    func toData(_ encoder: JSONEncoder) -> Data? {
+        return try? encoder.encode(self)
+    }
+}