[FEATURE]Integration to allow generic Core API call

[YANG-DB]

Is your feature request related to a problem?
In order to take full advantage of all the existing API and functionalities OpenSearch and its plugins provide, we need a generic way for the integration framework to be able to call any Core / Plugin API with the request body given as an integration asset.

What solution would you like?
Allowing a generic REST call strategy that will allow adding any type of API - Core or Plugin to be installed and maintained as part of the integration's assets.

What alternatives have you considered?
A clear and concise description of any alternative solutions or features you've considered.

Do you have any additional context?

• [META] [FEATURE] Add a WorkflowStep for calling external REST APIs flow-framework#522
• [RFC]Observability Workflow API observability#1805
• [RFC]Observability Correlation Zones opensearch-catalog#123