Refactor contact archivation

[artur-intech]

• New task: contacts:archive
• Archive inactive contacts every midnight
• Change log_domains.children column's type to jsonb

@ratM1n

• Notice changes in schedule.rb (https://github.com/internetee/registry/pull/1146/files#diff-b6de01cbd4b49ee8c835f6d988693033)
• A migration https://github.com/internetee/registry/pull/1146/files#diff-b3284f0eadfb18d72034542001018570 can take some time on production

Fixes #956

[karlerikounapuu]

Use bundle exec rake contacts:archive to archive contacts. As the task is ultimately time consuming, it's possible to start it again from the point it reached via contact id. This can be done via bundle exec rake contacts:archive[123], where 123 is the last contact.id which was processed (this can be obtained from tasks's stdout)

Changes
Populate config/application.yml with contact_archivation_log_file_dir. For example '/opt/webapps/app/export/contact_archivations'

In case of initial launch
Run bundle exec rake contacts:archive[0,true]. Second argument determines whether it's initial launch. In case it is, it logs destroyed contact object to directory specificed in ENV['contact_archivation_log_file_dir'] and skips poll messaging. Skipping initial processing can be continued later on as well, just replace 0 with last contact ID.