General purpose GraphQL client
The main interface in this package is [GraphqlClient], which produces a client (R6 class) with various methods for interacting with a GraphQL server. [GraphqlClient] also accepts various input parameters to set a base URL, and any headers required, which is usually the required set of things needed to connect to a GraphQL service.
[Query] is an interface to creating GraphQL queries, which works together with [GraphqlClient]
[Fragment] is an interface to creating GraphQL fragments, which works together with [GraphqlClient]