Add TextAlignVertical to FormBuilderTextField (#304)

Author: fer-ri

lib/src/fields/form_builder_text_field.dart

@@ -25,6 +25,7 @@ class FormBuilderTextField extends StatefulWidget {
   final StrutStyle strutStyle;
   final TextDirection textDirection;
   final TextAlign textAlign;
+  final TextAlignVertical textAlignVertical;
   final bool autofocus;
   final bool autocorrect;
   final bool maxLengthEnforced;
@@ -62,6 +63,7 @@ class FormBuilderTextField extends StatefulWidget {
     this.enableInteractiveSelection = true,
     this.maxLengthEnforced = true,
     this.textAlign = TextAlign.start,
+    this.textAlignVertical,
     this.autofocus = false,
     this.autocorrect = true,
     this.cursorWidth = 2.0,
@@ -174,6 +176,7 @@ class FormBuilderTextFieldState extends State<FormBuilderTextField> {
       onFieldSubmitted: widget.onFieldSubmitted,
       scrollPadding: widget.scrollPadding,
       textAlign: widget.textAlign,
+      textAlignVertical: widget.textAlignVertical,
       textCapitalization: widget.textCapitalization,
       textDirection: widget.textDirection,
       textInputAction: widget.textInputAction,