added and finalized unit tests for user, token_permission_types, identifier_Schemes, user_identifiers, organisations

Added domain to the identifier_Scheme table. Added unit and functional tests for the identifier_scheme functionality

Added a new identifier_schemes table and corresponding user_identifiers join table. Added the initial ORCID identifier scheme to the seeds.db file. Updated the locales file to include corresponding identifier tooltip language, logos, and initial connection message. Updated user profile page to dynamically display identifiers