Add Zod validation to GraphQL server

[Eprince-hub]

We are currently not validating the user inputs on the GraphQL server with Zod; instead, we are doing the validation with such code block like below. We want also to have Zod validation in GraphQL similar to what we have In Next.js Routes

 if (
      typeof args.firstName !== 'string' ||
      typeof args.type !== 'string' ||
      (args.accessory && typeof args.type !== 'string') ||
      !args.firstName ||
      !args.type
    ) {
      throw new GraphQLError('Required field missing');
    }