Add the ability to configure the RuntimeWiring at the SchemaParser building time

[stondini]

Hello,

I need to customize the RuntimeWiring through the RuntimeWiring.Builder when the schema parser is being built.

The class SchemaParserBuilder is directly instantiated by GraphQLJavaToolsAutoConfiguration. So, it's impossible to customize/inject the RuntimeWiring instance.

I need this to have the ability to set a GraphQLCodeRegistry when SchemaGenerator is used to create the executable schema.

What do you think ?

Thank you. Stephane