Adds a job info page for scheduled jobs which doesn't truncate args

Given the ease of this change, consider this the issue per Contributing.md.

The truncation of arguments at 100 characters in sidekiq-web makes it basically unusable for the scheduled jobs for me since our job classes are namespaced into modules and Moped::BSON::ObjectIds serialize themselves starting with `!ruby/object:Moped::BSON::ObjectId` which is more than 1/3 of the allotted space anyway.