Enable/Disable/Remove Shceduledtasks

[diogomelodantas]

Scheduledtask are set through config file added to repository using the following format:

name rate(## minutes)/(cron expression) command

To enable or disable a task it should accept the following format:

name enable/disable rate(## minutes)/(cron expression) command

If a task is removed from file this task must be removed from eventbridge/ecs.

[fagiani]

For the removal part of this enhancement, in order to keep track of scheduled tasks created by maestro, we need to tag them accordingly when put-rule and it looks like the checking process would require a sequence of commands to list-rules and iterate over the result set with list-tags-for-resource and match the tag to decide when to remove-targets and delete-rule.