[Meta] [Embeddable] Embeddable improvements

[dokmic]

This meta issue is to track the progress of the embeddable improvements.

• [Embeddable] Seamless React integration #140395.
• [Embeddable] Improve explicit input handling #140397.
• [Embeddable] Move attributes service #140400.
• [Embeddable] Refactor Embeddable Panel Components #140408.
• [Embeddable] Embeddable loading state refactoring #140409.
• [Embeddable] Review extension points #140411.
• [Embeddable] Improve unsaved changes checks #140413.
• [Embeddable] Improve inheritance to support embeddable variables #140405.

[elasticmachine]

Pinging @elastic/kibana-app-services (Team:AppServicesUx)

[ThomThomson]

Something that could potentially be added here is to look at implementing the new Redux state system in a real-world use case.

Building that system was an important step, but it hasn't been adopted yet, and the Presentation team is still using our own redux system. This is because we know it works, and we haven't had the resourcing or the risk appetite to migrate.

I would argue that it should be a priority for the App Services team to assist in the adoption of their tools to avoid having multiple competing systems that solve the same problem.

[elasticmachine]

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

[nreese]

Closing, individual issues tack work and meta issue not being used since no active work is occuring