* Bind sessions to identities
* Remove references to the identity token
* Move email changes to identity
* Move account menu into a turbo-frame
* Create tenants from a tenanted route
- New untenanted Identity and Membership models
- New `identity_token` cookie with path "/" holds state across tenants
We're not sure whether the untenanted database will be sqlite or
MySQL, and so I've been careful to minimize
- database reads, placing them behind etags and caching
- database writes, only writing when a new Session is created (login)
Note that we track two things in the identity_token cookie: a signed
id, and the updated_at for the underlying Identity object. This allows
us to effectively cache on the Identity without having to hit the
database, by using an Identity::Mock object that is compatible with
etag and cache methods.
The new integration test shows the desired user-facing behavior, which
is to make it easy to login without a tenanted URL and to jump between
tenants.
- the untenanted "login_help" page shows all linked memberships
- the jump menu shows all linked memberships (except the current)
Also introduced a utility script to populate existing employee
Identities, grouping accounts by email address.
Mike Dalessio