Updated client functionalities of job and service handling

[NaveenKinnal]

• Added client level functionalities to deploy single /multiple jobs, delete single / multiple jobs, check job status, get job logs and metadata, wait for job completion.

• Added client level functionalities to deploy single /multiple services, delete single / multiple services, check service status, get service logs and metadata.

• Added a null check for the job - started_at and stopped_at fields in the UI.

[NaveenKinnal]

Discrepancies with respect to the commit files