Copy the kubeedge api file to the staging directory

[wbc6080]

What type of PR is this?
/kind feature

What this PR does / why we need it:
Copy the kubeedge api file to the staging directory，and prepare for the subsequent establishment of kubeedge api repo(kubeedge/community#193)
Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

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[WillardHu]

Do we need to rename the stage project staging/src/github.com/kubeedge/api, like staging/src/github.com/kubeedge-api? Do we also need to map this folder to a github project?

[wbc6080]

Do we need to rename the stage project staging/src/github.com/kubeedge/api, like staging/src/github.com/kubeedge-api? Do we also need to map this folder to a github project?

Here I refer to the naming method of the api in the staging directory like in kubernetes https://github.com/kubernetes/kubernetes/tree/master/staging/src/k8s.io/api, which is directly called the api library. After this PR is merged, an api repo needs to be created, and the code will be synchronized from the staging directory to the api repo. In addition, I have also submitted an application for building the new api repo kubeedge/community#193. @WillardHu

[WillardHu]

Here I refer to the naming method of the api in the staging directory like in kubernetes https://github.com/kubernetes/kubernetes/tree/master/staging/src/k8s.io/api, which is directly called the api library. After this PR is merged, an api repo needs to be created, and the code will be synchronized from the staging directory to the api repo. In addition, I have also submitted an application for building the new api repo kubeedge/community#193. @WillardHu

Ok, I thought this directory github.com/kubeedge was new, but actually this directory is the parent directory of all subprojects.

[WillardHu]

/lgtm