[Refactor] Refactor the container start command flagging process

[Laitr0n]

Part of #1680

Checklist:

• Move startContainer from cmd to pkg/containerutil
• Create a file in pkg/api/types/${cmd}_types.go, and define the CommandOption for this command
• Create some file in pkg/cmd/${cmd}, and move the command entry point in real into this package

Signed-off-by: Laitron meetlq@outlook.com

[Laitr0n]

I have made an enormous change to refactor the container start command flagging process, but I break it down into 8 smaller commits which list in the checklist at the top comment.

[Laitr0n]

@AkihiroSuda @djdongjin @Zheaoli PTAL
If there are any problems,please let me know.<3

[AkihiroSuda]

Thanks