Implement data.query service observables to track state changes

[lizozom]

Add unified state change observables to query service, to replace existing callbacks (ATM we use a mix of observables for filters and timefilter and refresh interval and callbacks for query and saved query.

data.query.getStateChanged$() will trigger when time, filters, query, auto-refresh or saved query values change, with an object with the full current state.
Note: this doesn't necessarily mean data has to be re-fetched. For example, changing a disabled filter or stopping automatic refresh.

data.query.getFetch$() will trigger when a setting that requires fetching data changes. It should also trigger when a user clicks on the refresh button, without any state changes.

So a common application pattern would be:

<data.ui.SearchBar 
   appName="MyApp"
   query="initialQuery"
   filters="initialFilters"
   savedQueryId="initialSavedQueryId"
/>

....

data.query.getStateChanges$().subscribe(() => {
    // Update state
});

data.query.getFetch$().subscribe(() => {
    // Fetch data
});

Tasks

• Time changes Expose state container for global data updates from data plugin #56503 [State Management] State syncing helpers for query service I #56128
• RefreshInterval changes Expose state container for global data updates from data plugin #56503 [State Management] State syncing helpers for query service I #56128
• Filters (with appFilters, global indication) changes Expose state container for global data updates from data plugin #56503 [State Management] State syncing helpers for query service I #56128
• Have some sort of indication that a fetch is required. Lets think about it and address in a follow up PR.
• Support SavedQuery changes
• Support Query changes

[elasticmachine]

Pinging @elastic/kibana-app-arch (Team:AppArch)

[Dosant]

I also opened this one before which is related: #56503
The difference is, that in the moment we have to have helpers which observe separately for things that fall into AppState and into GlobalState

I actually started addressing that in https://github.com/elastic/kibana/pull/56128/files