Add LabelSelector and refactor source with model

[seokho-son]

• 대부분의 CB-TB 리소스 오브젝트에, Label 기능 추가

• Kubernetes 수준의 LabelSelector 기능 제공

  • Get resources based on a label selector. The label selector supports the following operators:
    • = : Selects resources where the label key equals the specified value (e.g., env=production).
    • != : Selects resources where the label key does not equal the specified value (e.g., tier!=frontend).
    • in : Selects resources where the label key is in the specified set of values (e.g., region in (us-west, us-east)).
    • notin : Selects resources where the label key is not in the specified set of values (e.g., env notin (production, staging)).
    • exists : Selects resources where the label key exists (e.g., env exists).
    • !exists : Selects resources where the label key does not exist (e.g., env !exists).

• 주요 type struct들을 model pkg로 이동 및 전체 정리

  • 또.. 눈빠지게 많은 수정 죄송합니다. 그래도 앞으로 더 편해지실 거예요.... ( @yunkon-kim @sykim-etri )

[seokho-son]

/approve