Add emailAddress, url TextInputTypes (#10471)

Adds support for requesting keyboards optimised for email address and URL entry.

packages/flutter/lib/src/services/text_input.dart

@@ -26,6 +26,12 @@ enum TextInputType {
 
   /// Optimize for date and time information.
   datetime,
+
+  /// Optimize for email addresses.
+  emailAddress,
+
+  /// Optimize for URLs.
+  url,
 }
 
 /// An action the user has requested the text input control to perform.