Add Redux StateManagement

[pepoospina]

Add redux state management. Once done, we should be able to create a component like this

export class MyComponentWithEveesAndStore extends stateConnect(LitElement)) {
  stateChanged(state) {...}
  goToSection(id: string) {
      access to this.evees.client
      access to this.store.dispatch(goToSection(id));
  }
}

For components that render one evee, we should also be able to do like this:

  export class MyComponentWithEveesAndStore extends AppEveesBaseElement<Section>)) {
  stateChanged(state) {...}
  dataUpdated() {...}
  goToSection(id: string) {
      access to this.evees.client
      access to this.store.dispatch(goToSection(id));
  }
}

The AppEveesBaseElement class should extend the EveesBaseElement to handle the client state, and include the app redux store too.

Note that our app state will be split in two: the redux state for app-specific state like the selected page, the status of some components, a snack bar, etc. But all the content-related state will be in the Client (this.evees.client...) service.

For this, we can create another HTML container element (similar to evees-container) that will send the store to the components using DOM events. The stateConnect() mixin will take care of injecting the store and the evees service and will replace and include the eveesConnect() mixin.