Support Custom Type Configuration

[MathieuLegault1]

Is your feature request related to a problem? Please describe.
I'd like to implement what this library currently does with relayConfig but for any custom type. It's currently possible to tell the generator that a graphql type (e.g. UserConnection) should be defined as an hardcoded class with a generic. I would like this possible for any type since I want to use the TypeDefinitionConfigurer from spring-graphql (https://docs.spring.io/spring-graphql/docs/1.2.2/reference/html/#execution.pagination.types). graphql-java-tools has something similar too.

Describe the solution you'd like
My goal here would be to define something like this:
type Mutation { participateToQuiz(quizId: Int!): ParticipationPayload @payload(for: "Participation") }

Then in the plugin configuration:

{
  "graphqlResolverGenerics": {
    "@payload": "com.kobylynskyi.graphql.Payload<%s>"
  }
}

This would then define the following resolver interface:

com.kobylynskyi.graphql.Payload<Participation> participateToQuiz(Integer quizId) throws Exception;

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.
I haven't identified alternative solutions to achieve the desired functionality.

I'm more than happy to implement this feature myself and would appreciate feedback on its feasibility and acceptance.

Thanks !