Migrate vaadin-select to use new base class

[web-padawan]

Motivation

This is an issue for adding slotted <input> (or <button>) support to vaadin-select.

Depends on #2197
Part of #84

Proposed solution

1. Add Lumo and Material theme to new package - Lumo prototype
2. Add custom element definitions to vaadin-select base class located in the new package.
3. Update vaadin-grid-pro-edit-select to depend on the new package and adjust its tests, if needed.
4. Remove old implementation, keep the imports and make it load the new package.
5. Once the new package is published, update Flow counterpart to use it instead of the old one.