add multiple eventsource functionality

[yaswanth-godspeed]

what we need:

• Currently we can generate CRUD APIs only with http.
• graphql event source also wants crud api generation.
• if we add multiple eventsource adding functionality, then user can select his desired ES.

Approach:

• adding one more question for eventsource selection with cli-select
• change prisma event generation with selected eventsource
• change elasticgraph event generation with selected eventsource