feat(GraphQL): Allow standard claims into auth variables

[minhaj-shakeel]

Fixes GRAPHQL-945.
This PR adds support for adding standard claims of a jwt token in the Auth Variables.
For eg, if the token contains claims given below and the namespace given in the authorization header is https://xyz.io/jwt/claims:

{
   "https://xyz.io/jwt/claims": [
      ....
   ],
  "ROLE": "ADMIN",
  "USERROLE": "user1",
  "email": "random@example.com",
  "email_verified": true,
  "sub": "1234567890",
  "aud": "63do0q16n6ebjgkumu05kkeian",
  "iat": 1611694692,
  "exp": 2611730692
}

Then the auth variables will also include the rest of the given claims along with the claims provided under https://xyz.io/jwt/claims.

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This change is 

[pawanrawal]

Can we add an e2e test showing that a standard claim is accessible and can be used within an auth rule?

Reviewed 2 of 2 files at r1.
Reviewable status: all files reviewed, 5 unresolved discussions (waiting on @minhaj-shakeel)

---

graphql/resolve/auth_test.go, line 182 at r1 (raw file):

		"ROLE":             "ADMIN",
		"email_verified":   true,
		"iss":              "https://cognito-idp.ap-southeast-2.amazonaws.com/ap-southeast-2_GfmeHdFz4",

change to a dummy value

---

graphql/resolve/auth_test.go, line 189 at r1 (raw file):

		"event_id":         "31c9d684-1d45-46f7-8c2b-cc27b1f6f01b",
		"token_use":        "id",
		"name":             "David Peek",

change the name

---

graphql/resolve/auth_test.go, line 190 at r1 (raw file):

		"token_use":        "id",
		"name":             "David Peek",
		"email":            "david@typejoin.com",

change this to a dummy value

---

graphql/resolve/auth_test.go, line 258 at r1 (raw file):

				"ROLE":             "ADMIN",
				"email_verified":   true,
				"iss":              "https://cognito-idp.ap-southeast-2.amazonaws.com/ap-southeast-2_GfmeHdFz4",

same as above, obfuscate the values

---

graphql/resolve/auth_test.go, line 386 at r1 (raw file):

				"token_use":        "id",
				"name":             "David Peek",
				"email":            "david@typejoin.com",

add a case where there is a collision between default and user-defined namespace

[pawanrawal]

Reviewed 1 of 2 files at r2.
Reviewable status: 2 of 3 files reviewed, all discussions resolved (waiting on @minhaj-shakeel)