Add suggest anomaly detector action to discover page (opensearch-proj…

…ect#849) (opensearch-project#873)

* Add generate anomaly detector action to discover page

Signed-off-by: gaobinlong <gbinlong@amazon.com>

* Add more test code and rename the file

Signed-off-by: gaobinlong <gbinlong@amazon.com>

* Modify flyout header

Signed-off-by: gaobinlong <gbinlong@amazon.com>

* Make the detectorName follow the convention

Signed-off-by: gaobinlong <gbinlong@amazon.com>

* Truncate the index pattern name if it's too long

Signed-off-by: gaobinlong <gbinlong@amazon.com>

* Move entry point to query editor

Signed-off-by: gaobinlong <gbinlong@amazon.com>

* Call the node API in dashboard-assistant plugin to generate parameters

Refactor unit test code

Signed-off-by: gaobinlong <gbinlong@amazon.com>

* Fix test failure

Signed-off-by: gaobinlong <gbinlong@amazon.com>

* Revert the code format

Signed-off-by: gaobinlong <gbinlong@amazon.com>

* Remove some empty lines

Signed-off-by: gaobinlong <gbinlong@amazon.com>

---------

Signed-off-by: gaobinlong <gbinlong@amazon.com>
(cherry picked from commit ec02b63)

Co-authored-by: gaobinlong <gbinlong@amazon.com>

opensearch_dashboards.json

@@ -7,7 +7,8 @@
   ],
   "optionalPlugins": [
     "dataSource",
-    "dataSourceManagement"
+    "dataSourceManagement",
+    "assistantDashboards"
   ],
   "requiredPlugins": [
     "opensearchDashboardsUtils",