#45 expose undo redo config

[andrewbeng89]

Enables optionally exposing/inspecting the done and undone stacks to the store or module using the plugin.

• undoRedoConfig object containing done and undone stacks are scaffolded to the state/module via a flag
• The internal setConfig function dispatches the updateUndoRedoConfig mutation (which is ignored by the plugin and not tracked in done and undone
• Unit test coverage for both namespaced and non-namespaced stores.