[META] APIs for Extension Point for creating a detector of AD

[owaiskazi19]

Is your feature request related to a problem?

The current architecture of plugins requires extension points for AD plugin to interact with OpenSearch from receiving a request from user to create a detector to returning the response to the user. The extension points which needs to be extensible are:

• getRestHandlers [FEATURE] [META] Register RestHandlers in OpenSearch #64
• createComponents Add create component extension point support for AD #78
• getSettings [Meta] [FEATURE] Add getSettings support for AD #79
• getActions [Meta] [FEATURE] Add getActions support for AD #80

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