Programatically control the expanded state of nodes

[ysalo]

The reason for needing this feature is to enable search and expanding the nodes if the desired value is found. In previous versions this feature was available through shouldExpandNode. The comment in the following PR https://github.com/reduxjs/redux-devtools/commit/81926f32123549fdfd1b9a236ba20743f17a3ff0#diff-a03ceeb079736a2c85af1c571a4120d34270942ece0d4e24e34aa0d0d4085a6cR7 instructs to open an issue if the functionality is needed.