Add support for parameter decorators in typescript

[meds]

The following does not work and causes issues when attempting to do reflection:

import { Field, ObjectType, ID, Query, Resolver, Arg } from "type-graphql";

import { Resolvers } from "../resolver";


@ObjectType()
class Recipe {
  @Field(type => ID)
  id: string;

  @Field(type => [String])
  ingredients: string[]
}


@Resolver(of => Recipe)
class RecipeResolver {   
    @Query(returns => String, { nullable: true })
    recipe(@Arg("title", type => String) title: string): string {
      return "test"
    }
}

It appears to be caused by the parameter decorator 'arg' being ignored.

[ejizba]

Closing this because it's old/stale and I don't see us adding support for decorators by itself. However, I'm sure it will be discussed as a part of #480