feat(material): support compareWith input for select type
feat(material): support compareWith input for select type

fix #982

ngx-formly/ngx-formly,formly-js/ng2-formly,formly-js/ng-formly,formly-js/ng-formly,ngx-formly/ngx-formly,ngx-formly/ngx-formly,formly-js/ng2-formly,ngx-formly/ngx-formly,formly-js/ng2-formly