WIP Feat: support service selector

[ethfoo]

Proposed Changes:

• support service selector in logconfig
• support ${_k8s.service.name} in typePodFields

cautions:

• service selector is not supported in clusterLogConfig.
• LogConfig CustomResourceDefinition schema should be be updated.
  add service fields:

              selector:
                properties:
                  service:
                    type: string