Ably Token Generation

[QuintinWillison]

The absence of this feature is a known limitation of this plugin.

See:

• Docs: Auth and Security: Token Authentication: 2.1: Ably TokenRequest is created by your servers and passed to clients
• RSA9: Auth function createTokenRequest
• TK1 and TK2: TokenParams

This may be lower priority as this method is intended to be executed server-side, however it's also useful for demos, examples and other forms of prototype as an alternative to having a "real" Auth server.

┆Issue is synchronized with this Jira Story by Unito