Add phone ext column to invites and phone ext field to new member form

atst/forms/member.py

@@ -21,6 +21,7 @@ class NewForm(FlaskForm):
         translate("forms.new_member.phone_number_label"),
         validators=[Optional(), PhoneNumber()],
     )
+    phone_ext = StringField("Extension")
     dod_id = StringField(
         translate("forms.new_member.dod_id_label"),
         validators=[Required(), Length(min=10), IsNumber()],

atst/models/mixins/invites.py

@@ -49,6 +49,7 @@ class InvitesMixin(object):
     first_name = Column(String)
     last_name = Column(String)
     phone_number = Column(String)
+    phone_ext = Column(String)
 
     def __repr__(self):
         role_id = self.role.id if self.role else None