PR cleans up presentation interface names for consistentency
* adds `$` suffix to all observables. For example, `dataLoading` =>
`dataLoading$`
* removes `Panel` naming convention from interface names since an api
may not be a panel, an api may be a dashboard. For example,
`PublisesPanelTitle` => `PublishesTitle`
#### Note to Reviewers
Pay special attention to any place where your application creates an
untyped API. In the example below, there is no typescript violation when
the parent returns `dataLoading` instead of `dataLoading$` since the
parent is not typed as `PublishesDataLoading`. Please check for
instances like these.
```
<ReactEmbeddableRenderer
getParentApi={() => {
dataLoading: new BehaviorSubject()
}}
/>
```
---------
Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>
Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>
Removes per-panel versioning and makes a few changes to further lock down types to make the new embeddable system more consistent and less error-prone.
### Changes
1. adds `hidePanelChrome` parameter to `ReactEmbeddableRenderer`. When
true, embeddable is rendered without `PresentationPanel` wrapper
2. Removes `embeddable-explorer` plugin
3. Moves Embeddable developer example into embeddable_examples plugin
4. Creates new examples that demonstrate how to use
`ReactEmbeddableRenderer`
<img width="600" alt="Screenshot 2024-04-23 at 5 19 18 PM"
src="5167a2a4-1968-42e6-92f7-4577c9cda3c6">
Follow-up work to narrow scope of this PR
1. add key concepts to embeddable overview
2. add "Register new embeddable type" tab that details how to create a
new embeddable and shows how you can add embeddable examples to
dashboard
3. group embeddable examples into a single item in "Add panel" menu - to
show best practices of how to keep menu clean
4. remove class based example embeddables
### Test instructions
1. start kibana with `yarn start --run-examples`
5. Open kibana menu and click "Developer examples"
6. Click "Embeddables" card and run examples
---------
Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>
