[Embeddable] Flexible Titling System

[ThomThomson]

What should we do?

Currently, title, description, and hidePanelTitles are fundamental pieces of every embeddable, and must be stored in the input and / or output of the embeddable. Every embeddable must have one and only one title, and must store it in the same way.

There are many cases where embeddables may not have titles, or may have a different requirement for showing titles internally. In order to allow flexibility for these use cases, we should use an interface and methods instead of tightly coupling titles to every embeddable type.

How is this done?

• Create an interface for titling that has getters and setters for description, title, hideTitles.
• Create a type guard that checks if an embeddable extends that interface
• Extend that interface in all embeddables which are expected to be titleable.
• Check the type guard and use the methods everywhere titles are interacted with in Kibana.

[elasticmachine]

Pinging @elastic/kibana-presentation (Team:Presentation)

[teresaalvarezsoler]

@ThomThomson this seems related with the embeddable refactor, can we close it?

[ThomThomson]

Yes good call, this was completed in #172017