Move RESP3TokenDecoder into its own file

Sources/RESP3/RESP3Token.swift

@@ -515,16 +515,3 @@ extension UInt32 {
     }()
 }
 
-public struct RESP3TokenDecoder: NIOSingleStepByteToMessageDecoder {
-    public typealias InboundOut = RESP3Token
-
-    public init() {}
-
-    public mutating func decode(buffer: inout ByteBuffer) throws -> RESP3Token? {
-        try RESP3Token(consuming: &buffer)
-    }
-
-    public mutating func decodeLast(buffer: inout ByteBuffer, seenEOF _: Bool) throws -> RESP3Token? {
-        try self.decode(buffer: &buffer)
-    }
-}

Sources/RESP3/RESP3TokenDecoder.swift

@@ -0,0 +1,29 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the RediStack open source project
+//
+// Copyright (c) 2023 RediStack project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of RediStack project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
+import NIOCore
+
+public struct RESP3TokenDecoder: NIOSingleStepByteToMessageDecoder {
+    public typealias InboundOut = RESP3Token
+
+    public init() {}
+
+    public mutating func decode(buffer: inout ByteBuffer) throws -> RESP3Token? {
+        try RESP3Token(consuming: &buffer)
+    }
+
+    public mutating func decodeLast(buffer: inout ByteBuffer, seenEOF _: Bool) throws -> RESP3Token? {
+        try self.decode(buffer: &buffer)
+    }
+}