Looser cookie name validation

[adamjmcgrath]

Description

The Joi token token validation is too strict for a cookie name, since these can contain dashes.

References

fixes #322
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie#attributes
https://joi.dev/api/?v=17.6.0#stringtoken

Testing

Describe how this can be tested by reviewers. Be specific about anything not tested and reasons why. If this library has unit and/or integration testing, tests should be added for new functionality and existing tests should complete without errors.

Please include any manual steps for testing end-to-end or functionality not covered by unit/integration tests.

Also include details of the environment this PR was developed in (language/platform/browser version).

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not master