[EPIC] Federated Pricing Engine Schema

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EPIC Federated Pricing Engine Schema

In this EPIC we'll get the Pricing Engine federation ready by updating it's GraphQL server to understand the Apollo federation syntax, extend appropriate external types and write resolvers for the extended types.

User Stories

• As a developer I want the Pricing Engine to work with the Federated Gateway:
• As a developer I want to see Pricing Engine data when I query Products from the Gateway:

Acceptance Criteria

• Implement Apollo Federated schema.
• Extend ProductVariant type to include Pricing Engine data.
• Resolver for extended ProductVariant type that returns prices by product ID