Release stytch-ruby v7 with new RBAC features

[logan-stytch]

RBAC

• The Stytch product will soon support role-based access control (RBAC)! See our RBAC guide at https://stytch.com/docs/b2b/guides/rbac/overview for more detailed explanations of our RBAC product.
• RBAC policies must be set through the dashboard, but you can use various endpoints to assign Roles to Members and add implicit role assignments to Organizations and SSO connections (more details in the guide at https://stytch.com/docs/b2b/guides/rbac/role-assignment).
• You can perform an RBAC authorization check when authenticating a JWT. This will use a locally cached version of the RBAC policy.
• Some endpoints, such as Create Member, offer out-of-the-box handling of RBAC authorization checks if a session token or session JWT is passed in.

Other changes

• Local JWT auth (both consumer and B2B) will set max_token_age_seconds to 300 if it was nil
• Fixed a bug in local B2B JWT auth that meant certain "Invalid JWT" error constants weren't imported – the end result is that an error was still thrown, just a less useful one than we intended.
• Calling authenticate_jwt_local will now marshal the decoded JWT into a session to be consistent with authenticate_jwt.
• authenticate_jwt and authenticate_jwt_local now accept an optional AuthorizationCheck parameter for performing RBAC checks. These will use a cached version of the project's RBAC policy in order to make an authZ verdict.
  B2B sessions objects now hold a LazyCache that keeps track of the project's RBAC policy. This will only refresh the policy when using local JWT authentication with an authorization check. In other words, if your project does not use local JWT auth with RBAC checks, the cache will never fetch the policy.
• Added support to core HTTP clients to send headers. This is used for certain routes that can be used in conjunction with RBAC for authorization, like magic_links.email.invite().
• Additionally, this update features a large amount of documentation updates which should better reflect what you can find at https://stytch.com/docs.