[Feature/extensions] Add getSettings support for AD

[dbwiddis]

Description

Copies the getSettings() method impelmentation from AnomalyDetectorPlugin to AnomalyDetectorExtension. This is the third and final step to complete work already done in SDK #147 and and OS #4519 register AD settings with OpenSearch

Issues Resolved

Fixes SDK #159
Relates to SDK #132

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[owaiskazi19]

@dbwiddis build is failing

[dbwiddis]

@dbwiddis build is failing

@owaiskazi19 Build is failing because SDK #163 changed the API. You would need to change other code here to comply with that new API.

However, don't bother with that, because 169 and 4705 will change it again. So this is currently blocked by those other PRs.

Suggestion:

• merge 169 / 4705
• i will submit another PR here to fix the broken build
• the tests will then pass for this PR

[dbwiddis]

Updated the RestCreateDetectorAction (which was just a copy of hello world) with the new version of Hello World. Tests should pass once both 4705 and 169 are merged.

[dbwiddis]

169 and 4705 merged, should be able to re-run the tests now.

[owaiskazi19]

@saratvemulapalli can you take of it? I don't have access to rerun the test for AD.

[saratvemulapalli]

Kicked them off.
Another hacky way to re-run them is to do a force push without any changes. ;)

[dbwiddis]

Will probably have to do that. I think the rerun is not pulling the updated branches.

[dbwiddis]

Well now it's failing on something else entirely, probably something commented out that's still being tested. I give up.

[dbwiddis]

The BaseNodeRequest class was removed by @nknize in #4702.

[dbwiddis]

Relevant comments:

* @deprecated this class is deprecated and classes will extend TransportRequest directly
 */
// TODO: this class can be removed in main once 7.x is bumped to 7.4.0

[dbwiddis]

All green.

And this, kids, is why you pay attention to those little IDE flags that say you're using deprecated code. :-)

[dbwiddis]

OK, ready to merge. I'm getting confused by this same fix not working on main here, but I'm not sure it's broken (yet) on main here.