Adds a userpools catalog entry, schema and AwsUserPoolsAdapter, verified
against Floci core:
- list/get/create/delete user pools; create can set email or username
sign-in, a relaxed password policy for local test users, and a public
app client (on by default) whose id is surfaced in the pool metadata
- users as the pool's child items: list (paged), get, create and delete;
passwords are set permanent by default so users can sign in at once
- map Cognito's HTTP-400 error names (UserNotFoundException,
UsernameExistsException, AliasExistsException, InvalidPasswordException)
- link Floci's cognito-idp service to the new page on the diagnostics page
Zakaria