Create different structs different types of queries.

[ikaneshiro]

Currently the compute client package uses structs that mimic the types of the GraphQL API, this results in issues when trying to form a query with stucts of the form:

type Job struct {
    Requires []Job
}

Due to some infinite recursion.

A better approach involves using structs that are query specific in order reflect the interesting data the query and properly declare the depth of search.