Handle on-type formatting requests

Author: MahdiBM

Sources/SourceKitLSP/Swift/DocumentFormatting.swift

@@ -15,6 +15,7 @@ import Foundation
 package import LanguageServerProtocol
 import LanguageServerProtocolExtensions
 import SKLogging
+import SKUtilities
 import SwiftExtensions
 import SwiftParser
 import SwiftSyntax