Reduce base bundle size

[jasonkuhrt]

Perceived Problem

The way Graffle is currently built leads to dragging in all/most of graphql package even when its features are not be used (for example: send a document as a string to a GraphQL schema over HTTP).

Ideas / Proposed Solution(s)

• Turn Memory transport into an extension so that its reliance on "heavy" parts of graphql (like execute which alone is 350+kb) is not forced into core
• Audit graphql utility imports for accidental dragging in of many KBs

[jasonkuhrt]

Basically a sub issue of this #1223