feat(schema): Split resolver options and property resolvers

[daffl]

This pull request is a backwards compatible change that allows to define property resolvers at the top level instead in the properties:

const userResolver = resolve<User, MyContext>({
    isDrinkingAge: async (value, user, context) => {
      const drinkingAge = await context.getDrinkingAge(user.country)

      return user.age >= drinkingAge
    },
    fullName: async (value, user, context) => {
      return `${user.firstName} ${user.lastName}`
    }
  },
  {}
)

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