Enhance schema introspection to report `@Argument` name mismatch

[smilyanovr]

Sometimes it is easy to make a mistake with argument names in @QueryMapping methods. This is not reported by schema introspection and error will bubble up on query execution.

Here is a sample schema:

type Query {
    getVehicle(id: ID): Vehicle
}

And this is example controller:

@Controller
class VehicleController {
  
    @QueryMapping
    fun getVehicle(@Argument vehicleId: String) = null
}

@Argument allows to map the argument name internally, though it will be really nice to see such kind of mismatch reported by schema introspection report.

[rstoyanchev]

Sounds like a good one to consider indeed. I think it applies to any @SchemaMapping method, not just queries.

[smilyanovr]

Correct. It applies also to @SchemaMapping.