Support deprecation of input object fields and arguments (#864, #1347)

[tyranron]

Resolves #864
Part of #1347

Synopsis

GraphQL spec September 2025 supports deprecation of input object fields and arguments.

See also:

• Allow deprecation of input values graphql/graphql-spec#525
• Allow deprecation of input values (field args, directive args, input fields) graphql/graphql-spec#805
• Make the reason argument in @deprecated non-nullable graphql/graphql-spec#1040
• make includeDeprecated non nullable graphql/graphql-spec#1142

Solution

• Support #[deprecated] and #[graphql(deprecated)] attributes in #[derive(GraphQLInputObject)] macro for fields.
  • Cover with positive codegen tests.
  • Prevent incorrect applying in compile time.
  • Cover with negative codegen tests.
  • Cover in macro documentation.
  • Cover in Book.
• Support #[deprecated] and #[graphql(deprecated)] attributes in #[graphql_object] and #[graphql_inteface] macros for arguments.
  • Cover with positive codegen tests.
  • Prevent incorrect applying in compile time.
  • Cover with negative codegen tests.
  • Cover in macro documentation.
  • Cover in Book.
• Support deprecation in schema::meta::Argument.
• Renew Type System Definitions.
• Renew canonical introspection query.