Implement Server Health Check endpoint

[RaghuMeda]

Feature description
It requires a health check endpoint for the Server so that it can be monitored for service availability. That also helps the client to invoke that simple health check endpoint (which doesn't require any payload) to verify the service is available to consume or not before it hits the main endpoints with the payload. It will also help during testing and as well as post deployment verification of the Server.

Relevant specifications and corresponding sections
General Service Health check implementation.

Additional context
It is discovered that there is no health check endpoint implemented currently in server.py due to which it is not helping to verify if the server has been deployed and running as expected during testing. Hence raised this issue as a backlog to implement.