Add logs subcommand (#71)

* Make ssm subcommand require node argument

* Add cloudwatch log streams to logs subcommand

* Add node logging capabilities

* Implement crude follow for cloudwatch

* Add node query for files, follow, and multiple services

* Working follow and multi query for CWL

* Remove exec kubectl calls

* Close node logs channel

* Add extra checks for control plane logging

* Add function comments and remove unused code

* remove unused copyright banner