Output some useful information when running the rails console

changelogs/unreleased/bw-add-console-message.yml

+---
+title: Output some useful information when running the rails console
+merge_request: 18697
+author:
+type: added

config/initializers/console_message.rb

+# rubocop:disable Rails/Output
+if defined?(Rails::Console)
+  # note that this will not print out when using `spring`
+  justify = 15
+  puts "-------------------------------------------------------------------------------------"
+  puts " Gitlab:".ljust(justify) + "#{Gitlab::VERSION} (#{Gitlab::REVISION})"
+  puts " Gitlab Shell:".ljust(justify) + Gitlab::Shell.new.version
+  puts " #{Gitlab::Database.adapter_name}:".ljust(justify) + Gitlab::Database.version
+  puts "-------------------------------------------------------------------------------------"
+end