Customize the grid by replacing the default one with your own
NOTE: That you need to add a vaadin-crud-edit-column in order to have a mechanism for editing the item
Provide an element with the editor content to customize the editor
NOTE: You can add any element that provides a value property and a validation mechanism: validate or checkValidity
You can add content to the toolbar and bind to the `size` property
NOTE: You need to provide an element marked with the attribute 'new-button' in order to have a mechanism for adding new items