Authorization validate argument should also handle a single (non-array) entry

[mjfwebb]

The library is throwing an error if the validate argument is not an array.

We should be able to handle both an array of arguments and a single non-array argument:

validate: { where: { jwt: { roles_INCLUDES: "admin" } } }

validate: [{ where: { jwt: { roles_INCLUDES: "admin" } } }]

Currently, it only accepts the latter where the argument is an array. With the former, the following error is thrown by the library:

    TypeError: validate?.map is not a function

      35 |     };
      36 |     const filterRules = filter?.map((rule) => new AuthorizationFilterRule(rule as AuthorizationFilterRuleConstructor));
    > 37 |     const validateRules = validate?.map(
         |                                     ^
      38 |         (rule) => new AuthorizationValidateRule(rule as AuthorizationValidateRuleConstructor)
      39 |     );
      40 |

      at parseAuthorizationAnnotation (packages/graphql/src/schema-model/parser/annotations-parser/authorization-annotation.ts:37:37)