Allow role assignments to belong to an organisation

[tuzz]

As per the Change Proposal and the Data Model, add an organisations table into the profile application. Assignments can have an optional association to an organisation. Organisations should be included in the response from the HydraV1 public /userinfo endpoint:

 "aud"=>["editor-dev"],
 "auth_time"=>1708013425,
 "country"=>"United Kingdom",
 "country_code"=>"GB",
 "email"=>"john.doe@example.com",
 "email_verified"=>true,
 "iat"=>1708013425,
 "iss"=>"http://localhost:9001/",
 "name"=>"John Doe",
 "nickname"=>"John",
 "picture"=>"http://localhost:3002/profile/bbb9b8fd-f357-4238-983d-6f87b99bdbb2/avatar",
 "postcode"=>nil,
 "profile"=>"http://localhost:3002/profile",
 "rat"=>1708013425,
 "roles"=>"school-owner",
 "organisations"=> {
   "485ac1e2-1e57-4023-9514-6d5f572bd901"=>"school-owner,school-teacher"    <--- add this
 }
 "sub"=>"bbb9b8fd-f357-4238-983d-6f87b99bdbb2",
 "user"=>"bbb9b8fd-f357-4238-983d-6f87b99bdbb2",
 "username"=>""