Add api -> worker communication

[vitaliimelnychuk]

There is introduced schema in WiseEngineering/crispy-worker#6

We need to add a call in API to be able to run something in specific worker.
The flow will be like this:

Crispy-web is able to see workers and migrations.
Crispy-web is able to run mutation in crispy-api to run specific migration in specific workers.

Here we need to implement this ability to call worker with migration and job from API.