v4: Make session cookie name configurable again

[SiebelsTim]

Checklist

• I have looked into the Readme, Examples, and FAQ and have not found a suitable solution or answer.
• I have looked into the API documentation and have not found a suitable solution or answer.
• I have searched the issues and have not found a suitable solution or answer.
• I have searched the Auth0 Community forums and have not found a suitable solution or answer.
• I agree to the terms within the Auth0 Code of Conduct.

Describe the problem you'd like to have solved

In v3, I could simply configure the session name.

{
    session: {
      name: 'SessionCookieName'
    }
}

In v4, it is hard coded: https://github.com/auth0/nextjs-auth0/blob/v4/src/server/session/abstract-session-store.ts#L70

Describe the ideal solution

Make the cookie name configurable when initializing the Auth0Client.

Alternatives and current workarounds

none

Additional context

No response