[Discover] Allow inline editing in Lens charts on the dataview mode

[stratoula]

Describe the feature:
Discover supports 2 modes:

• DataView mode. It is the default one where the users can select their datasource from the dataview picker and apply filtering with KQL or the filter builder
• ES|QL mode: Users can switch to this from the dataview picker. This mode has more capabilities from the default one as the user can use the query for many things (aggs, formulas, lookups, new fields etc). This mode also allows the users to edit the suggested Lens charts immediately from Discover without navigating to Lens

The same experience can also be applied on the dataview mode. Instead of redirecting users to Lens, we can use the inline editing flyout to give the same capabilities as in the ESQL mode.

The advantage is that the users will be able to accomplish many things from Discover such as adding reference lines and annotations and immediately save to the dashboard.

Bonus idea

Right now if I want to visualize a field I have to click the Visualize button and go to Lens. We could instead update the Discover histogram with the suggestion from Lens. With inline editing enabled the users can make the changes they want and immediately add to dashboard. As a result the users never leave the Discover app, only for saving to a dashboard.

[elasticmachine]

Pinging @elastic/kibana-visualizations (Team:Visualizations)

[elasticmachine]

Pinging @elastic/kibana-data-discovery (Team:DataDiscovery)

[davismcphee]

I love this, and the bonus idea too! This would truly be DiscoLens 🪩

@stratoula do you have any thoughts on what we might be able to do with saved searches that were previously saved with breakdown fields, since I'm assuming the ideas is we'd replace the breakdown functionality with this?

[stratoula]

This is a good question. I remember that @timductive had suggested to leave the breakdown as it is. (Which means have it above the chart and also in the flyout - they should be synced of course).
But in general I thing we need to discuss with more details what saved search is (now that we have ESQL with charts or in the future where you will be able to create whatever chart you want from Discover). Worth a meeting I think!

[davismcphee]

Leaving a note here to say that we should resolve #167887 and make sure visualizations save with saved searches before we do this enhancement.