autograde-service should provide an enpoint to inspect jobs

Add the following endpoints:

GET: /api/v1/jobs/${id}/status
GET: /api/v1/jobs/${id}/logs

Before this, we should probably write the abstract specification of what an autograde job is. For us, we use underlying Kubernetes jobs to represent jobs. Therefore, we should probably make sure that the specification of autograde job is compatible with Kubernetes job

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