Give access to `monitorState` for custom tabs components

[zalmoxisus]

It allows submonitors in tabs to have access and update monitorState. For example redux-devtools-test-generator can persist test templates. We're not dividing them into substates, so one should do it on the submonitor side like so. It could be useful to have access to the whole monitorState, for example, for Chart tab we can switch to other tab when the node is clicked.