wsgi: add create-users CLI command

Add a general-purpose `create-users` command that creates one or more
users with explicitly specified name, email, password and role.

Supported roles: system-admin (assigns default roles plus
grant_sysadmin_role), none (assigns default roles only).

Output is written as JSON to a file (with 0600 permissions) or stdout.
Helper functions __parse_user_spec__ and __write_output__ are factored
out for reuse by the forthcoming create-test-users command.

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