Add support for ability to chain operations

[coco98]

Based on a conversation with Pierre on the Legend team at GS:

Aggregations on a GraphQL API are much harder for data consumers to pick up and use, and people prefer a tabular data structure that they can project, filter and aggregate. The reason they prefer the tabular structure is because they aren't constrained by the type system and can easily chain a sequence of operations. This is the KEY ask for teams working in financial services.

What would the equivalent in the GraphQL world be?

Eg: Do we need to introduce meta type to represent a tabular structure that can be introspected on the fly - to permit tools like graphiql, graphql-codegen to validate queries entirely on the client side?