Consumer needs to be able to reset EuiBasicTable selection state

[cjcenizal]

In elastic/kibana#21574, we have a component that combines EuiSearchBar with EuiBasicTable. We want to clear the selection state whenever the query changes. Otherwise you can get in situations where the selection state has persisted but the search bar thinks nothing is selected:

This problem manifests itself in the EuiInMemoryTable too, which can't reconcile selection state between the two components:

[cjcenizal]

The solution to this bug may enable #1077, depending on the implementation.