[Canvas] Markdown element auto-applies text changes.

[Kuznietsov]

Summary

Closes: #125999

• Added editor argument, which is rendering monaco code editor with markdown syntax highlighting and auto-applying of the text changes.
• Added the ability for withDebouncedArg to handle the changed argument from within the expression.

Testing notes

Screen.Recording.2022-06-01.at.18.03.11.mov

[Kuznietsov]

@elasticmachine merge upstream

[elasticmachine]

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

[Kuznietsov]

@elasticmachine merge upstream

[Heenawter]

Tested locally + code review - everything works great! Left one tiny clarification question, but it's not a blocker 👍

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: a37e8f9
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• Webpack Bundle Analyzer

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
canvas	1138	1139	+1

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
canvas	1.0MB	1.0MB	+1.1KB

History

• 💚 Build #49746 succeeded e75d51a
• 💚 Build #49249 succeeded 3e693cb
• 💚 Build #48786 succeeded 2350213
• 💚 Build #48691 succeeded 1c8eacc

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @Kunzetsov

[rashmivkulkarni]

@elastic/kibana-presentation - Do you think its prudent to add an unit/ functional test to such UI changes ? Apply button has been removed and the monaco editor auto saves everything now . plz advice...Thankyou.