RFC: Lazy PageInfo resolving

[mxstbr]

Summary

When using t.connection, I have to always resolve hasNextPage and hasPreviousPage in resolve(), even if either of those fields isn't requested. Example: https://github.com/rauchg/next-ai-news/blob/f766e2c388c4cc9ed74e45ff71ab7fe54436d306/types/Story.ts#L49-L95

Proposed Solution

Some way to define individual resolvers for hasNextPage and hasPreviousPage that only get run if the corresponding fields are actually in the query.