Summary:
Moved server and worker from bolt to communication. Started
templatization.
Started removal of Bolt class.
Removed unnecessary files from network.
Converted states to template functions.
Bolt::Session is now a template.
Merge remote-tracking branch 'origin/dev' into mg_refactor_network
Merged bolt_serializer.cpp into hpp.
Removed obsolete include.
Initial version of bolt session unit test.
Uncommented leftover log commands.
Reimplemented io::Socket.
Added client-stress.sh script.
Reviewers: dgleich, buda
Reviewed By: dgleich, buda
Subscribers: pullbot, mferencevic, buda
Differential Revision: https://phabricator.memgraph.io/D64
