[Swift] Renaming protocols (#6469)

* Renaming protocols

* Updates Generated code

* format code

swift/Sources/FlatBuffers/FlatBufferObject.swift

@@ -26,7 +26,7 @@ public protocol FlatBufferObject {
   init(_ bb: ByteBuffer, o: Int32)
 }
 
-public protocol ObjectAPI {
+public protocol ObjectAPIPacker {
   associatedtype T
   static func pack(_ builder: inout FlatBufferBuilder, obj: inout T) -> Offset<UOffset>
   mutating func unpack() -> T

swift/Sources/FlatBuffers/NativeObject.swift

@@ -16,14 +16,14 @@
 
 import Foundation
 
-public protocol UnionObject {}
+public protocol NativeObject {}
 
-extension UnionObject {
+extension NativeObject {
 
   /// Serialize is a helper function that serailizes the data from the Object API to a bytebuffer directly th
   /// - Parameter type: Type of the Flatbuffer object
   /// - Returns: returns the encoded sized ByteBuffer
-  public func serialize<T: ObjectAPI>(type: T.Type) -> ByteBuffer where T.T == Self {
+  public func serialize<T: ObjectAPIPacker>(type: T.Type) -> ByteBuffer where T.T == Self {
     var builder = FlatBufferBuilder(initialSize: 1024)
     return serialize(builder: &builder, type: type.self)
   }
@@ -36,7 +36,7 @@ extension UnionObject {
   /// - Returns: returns the encoded sized ByteBuffer
   /// - Note: The `serialize(builder:type)` can be considered as a function that allows you to create smaller builder instead of the default `1024`.
   ///  It can be considered less expensive in terms of memory allocation
-  public func serialize<T: ObjectAPI>(builder: inout FlatBufferBuilder, type: T.Type) -> ByteBuffer where T.T == Self {
+  public func serialize<T: ObjectAPIPacker>(builder: inout FlatBufferBuilder, type: T.Type) -> ByteBuffer where T.T == Self {
     var s = self
     let root = type.pack(&builder, obj: &s)
     builder.finish(offset: root)