[META] Create Infrastructure for the workflow

[owaiskazi19]

Is your feature request related to a problem?

Assemble plugins API with transport client for workflow setup of Semantic Search & generate a workflow id.

• [FEATURE] Register and Deploy remote model #86
• [FEATURE] Register Model Group for model #83
• [FEATURE] Create Connector for remote model #70
• [FEATURE] Create an ingest pipeline workflow step #24
• Create an index and map it to the created neural pipeline created above.
• Register Agent - [FEATURE] Register Agent Workflow Step #194
• Register Sub Agents - [FEATURE] Register Agent Workflow Step #194

What solution would you like?

Few of the task can be achieved by using MLClient from ml-commons to invoke the request on transport layer. For the others APIs of OpenSearch can be used.

Do you have any additional context?

This will be a one time setup for creating the required complex setup for Semantic Search. Later, user would be able to invoke the SearchRequest directly using the setup created above.