Added TokenSyntax identifier property

This acts as a convenience property to convert a TokenSyntax to an
Identifier

Author: adammcarter

Sources/SwiftSyntax/Identifier.swift

@@ -12,7 +12,7 @@
 
 import Foundation
 
-public struct Identifier {
+public struct Identifier: Equatable {
   public let name: String
 
   public init(_ token: TokenSyntax) {

Sources/SwiftSyntax/TokenSyntax.swift

@@ -153,6 +153,11 @@ public struct TokenSyntax: SyntaxProtocol, SyntaxHashable {
     }
   }
 
+  /// An identifier created from `self`.
+  public var identifier: Identifier {
+    Identifier(self)
+  }
+
   /// A token by itself has no structure, so we represent its structure by an
   /// empty layout node.
   ///

Tests/SwiftSyntaxTest/TokenSyntaxTests.swift

@@ -0,0 +1,22 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2024 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+import SwiftSyntax
+import XCTest
+
+class TokenSyntaxTests: XCTestCase {
+
+  public func testTokenSyntaxIdentifier() {
+    let tokenSyntax = TokenSyntax(stringLiteral: "sometoken")
+    XCTAssertEqual(tokenSyntax.identifier, Identifier(tokenSyntax))
+  }
+}