[Event annotations] Individual annotation editing from library (#163346)

## Summary

Resolve https://github.com/elastic/kibana/issues/158774
Part of https://github.com/elastic/kibana/issues/159053

<img width="1920" alt="Screenshot 2023-09-13 at 2 00 25 PM"
src="69cfe07e-d442-462b-91c5-395d6040c383">

<img width="1920" alt="Screenshot 2023-09-13 at 2 00 09 PM"
src="260aedbe-31d0-415a-b387-10a9b13bf9a6">

<img width="1920" alt="Screenshot 2023-09-13 at 2 01 07 PM"
src="9672010b-d49b-4041-acf1-33d3baec1e9a">


### Known issues
- [ ] ~Responsive layout~ **Proposal:** don't optimize for mobile
- [x] Recovering embeddable from problematic data view state
- [x] margin around dimension buttons
- [x] Functional test coverage

### Checklist

- [x] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)
- [x]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials
- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [x] Any UI touched in this PR is usable by keyboard only (learn more
about [keyboard accessibility](https://webaim.org/techniques/keyboard/))
- [ ] Any UI touched in this PR does not create any new axe failures
(run axe in browser:
[FF](https://addons.mozilla.org/en-US/firefox/addon/axe-devtools/),
[Chrome](https://chrome.google.com/webstore/detail/axe-web-accessibility-tes/lhdoppojpmngadmnindnejefpokejbdd?hl=en-US))
- [x] This renders correctly on smaller devices using a responsive
layout. (You can test this [in your
browser](https://www.browserstack.com/guide/responsive-testing-on-local-server))
- [ ] This was checked for [cross-browser
compatibility](https://www.elastic.co/support/matrix#matrix_browsers)

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>
Co-authored-by: Stratoula Kalafateli <efstratia.kalafateli@elastic.co>

docs/developer/plugin-list.asciidoc

@@ -102,6 +102,10 @@ This API doesn't support angular, for registering angular dev tools, bootstrap a
 |The Event Annotation service contains expressions for event annotations
 
 
+|{kib-repo}blob/{branch}/src/plugins/event_annotation_listing/README.md[eventAnnotationListing]
+|This plugin contains the library listing page for event annotation groups.
+
+
 |{kib-repo}blob/{branch}/src/plugins/expression_error/README.md[expressionError]
 |Expression Error plugin adds an error renderer to the expression plugin. The renderer will display the error image.
 

docs/user/dashboard/lens.asciidoc

@@ -222,9 +222,11 @@ Annotations support two placement types:
 
 * *Custom query* &mdash; Displays annotations based on custom {es} queries. For detailed information about queries, check <<semi-structured-search>>. 
 
-Create the annotation layer. 
+Any annotation layer can be saved as an annotation group to the *Visualize Library* in order to reuse it in other visualizations. Any changes made to the annotation group will be reflected in all visualizations to which it is added.
 
-. In the layer pane, click *Add layer > Annotations*.
+Create a new annotation layer. 
+
+. In the layer pane, click *Add layer > Annotations > New annotation*.
 
 . Select the {data-source} for the annotation.
 
@@ -263,6 +265,20 @@ Specify the annotation appearance.
 
 . To close, click *X*.
 
+Save the annotation group to the library. 
+
+. In the layer pane, on your annotation layer, click image:images/lens_saveAnnotationLayerButton_8.9.0.png[Save button on annotations layer].
+
+. Enter the *Title*, *Description*, and add any applicable <<managing-tags,*Tags*>>.
+
+. Click *Save group*.
+
+Add a library annotation group to a visualization.
+
+. In the layer pane, click *Add layer > Annotations > Load from library*.
+
+. Select the annotation group you want to use.
+
 [float]
 [[add-reference-lines]]
 ==== Add reference lines