feat(firebase_ui_auth): add autofocus property to PhoneInput widget (#334)

Co-authored-by: russellwheatley <[email protected]>

Author: orenagiv

packages/firebase_ui_auth/lib/src/widgets/phone_input.dart

@@ -91,6 +91,9 @@ class PhoneInput extends StatefulWidget {
   /// picker.
   final String? initialCountryCode;
 
+  /// Whether the phone input text field should be focused as soon as it's visible.
+  final bool autoFocus;
+
   /// Returns a phone number from the [PhoneInput] that was provided a [key].
   static String? getPhoneNumber(GlobalKey<PhoneInputState> key) {
     final state = key.currentState!;
@@ -106,6 +109,7 @@ class PhoneInput extends StatefulWidget {
   const PhoneInput({
     super.key,
     this.initialCountryCode,
+    this.autoFocus = true,
     this.onSubmit,
   });
 
@@ -318,7 +322,7 @@ class PhoneInputState extends State<PhoneInput> {
                       autofillHints: const [
                         AutofillHints.telephoneNumberNational
                       ],
-                      autofocus: true,
+                      autofocus: widget.autoFocus,
                       focusNode: numberFocusNode,
                       controller: numberController,
                       placeholder: l.phoneInputLabel,