ML job reset endpoint

[jgowdyelastic]

A new endpoint has been added for reseting anomaly detection jobs
elastic/elasticsearch#73908

POST _ml/anomaly_detectors/<job_id>/_reset

I imagine the request type will looks something like this

export interface MlResetJobRequest extends RequestBase {
  job_id: Id
  wait_for_completion?: boolean
}

MlJob will also need updating with new properties added with this reset work

 class MlJob {
...
+ blocked?: MlJobBlocked
 }

where MlJobBlocked should look like this:

MlJobBlocked {
  reason: 'delete' | 'revert' | 'reset';
  task_id?: string;
}