* Make the executor and validation APIs public to enable splitting parsing and execution into two stages
Based on https://github.com/graphql-rust/juniper/pull/773#issuecomment-703783048 and https://github.com/graphql-rust/juniper/pull/773#issuecomment-704009918
* Fix fmt warning for visit_all_rules
* Add `Definition` to the public API so it's available for the result of compilation
* Make OperationType public so that user land code can tell the difference between query/mutation and subscription
* Add integrations tests for execute_validated_query_async, visit_all_rules, get_operation, and resolve_validated_subscription
Co-authored-by: Christian Legnitto <LegNeato@users.noreply.github.com>
- reimplement #[derive(GraphQLUnion)] macro to support:
- both structs and enums
- generics in type definition
- multiple #[graphql] attributes
- external resolver functions
- remove From trait impls generation for enum variants
- reimplement #[graphql_union] macro to support:
- traits
- generics in trait definition
- multiple attributes
- external resolver functions
- GraphQLType implemetation for a raw trait object
- GraphQLTypeAsync implemetation (#549)
- add marker::GraphQLUnion trait
- rewrite "2.5 Unions" section in Book (Juniper user documentation)
- rewrite `codegen` and `codegen_fail` integration tests for GraphQL unions
Additionally:
- re-export `futures` crate in `juniper` for convenient reuse in the generated code without requiring library user to provide `futures` crate by himself (#663)
- use unit type () as default context for EmptyMutation and EmptySubscriptions
- relax Sized trait bound on some GraphQLType and GraphQLTypeAsync definitions, implementations and usages
