Add support to set a SLA by API

[regismachado]

It's necessary to enhance the cli commands to support the set of an SLA for a job schedule.

We have to follow the https://azkaban.github.io/azkaban/docs/latest/#api-set-sla

[Perkles]

Hi @regismachado 👋
Can i work on this issue ?

[regismachado]

Hi @Perkles

Yes 😃.