Implement declarative auth design for GraphQL module

[ldclakmal]

Description:
Implement imperative auth design for ballerina/graphql module
Design: https://docs.google.com/document/d/1dGw5uUP6kqZNTwMfQ_Ik-k0HTMKhX70XpEA3tys9_kk/edit?usp=sharing

References:

1. https://graphql.org/learn/authorization/
2. https://graphql.org/learn/thinking-in-graphs
3. https://graphql.org/graphql-js/authentication-and-express-middleware/
4. https://www.apollographql.com/docs/apollo-server/security/authentication/
5. https://medium.com/the-guild/authentication-and-authorization-in-graphql-and-how-graphql-modules-can-help-fadc1ee5b0c2
6. https://www.moesif.com/blog/technical/api-design/Steps-to-Building-Authentication-and-Authorization-For-GraphQL-APIs/
7. https://www.apollographql.com/docs/react/data/error-handling/
8. https://blog.pusher.com/handling-authentication-in-graphql-jwt/
9. https://docs.microsoft.com/en-us/graph/errors
10. https://shopify.dev/concepts/about-apis/response-codes
11. https://www.howtographql.com/graphql-python/4-authentication/
12. https://the-guild.dev/blog/graphql-modules-auth