[Improvement] Remove sortable identifiers from the users table

[shepilov]

Context Right now we have to join queries in PostgreSQL like this if we want to find docs for the user

select * from ext.drive_files f
    where string_to_array(creator, '-') <@ string_to_array('11ee-ba16-ada1e820-959c-6f5013877a67', '-');

Because we rearrange string identifiers parts to make it sortable in Cassandra

TODO

• [ ] Remove all the code with timeuuid modification
• [ ] Use in drive-file and user table the same identifier
• [ ] Make a migration script to transform data and store only uuid
• [ ] Make sure that we don't sort data by uuid during search requests