Refactor sparkctl

[ChenYi015]

Purpose of this PR

Proposed changes:

Refactor sparkctl:

• Use controller-runtime client instead of generated crd client to interact with API server
• sparkctl status sub command is moved to sparkctl get so that it be consistent with kubectl get
• Adjust the sparkctl directory structure as follows:

$ tree -L 2 cmd/sparkctl
cmd/sparkctl
├── README.md
├── create
│   ├── create.go
│   ├── create_test.go
│   ├── gcs.go
│   ├── s3.go
│   └── testdata
├── delete
│   └── delete.go
├── event
│   └── event.go
├── forward
│   └── forward.go
├── get
│   └── get.go
├── list
│   └── list.go
├── log
│   └── log.go
└── main.go

[google-oss-prow]

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[ChenYi015]

/assign @jacobsalway