Implement endpoint for node query

[xichen1]

Implement the api, enable querying the node's status through node_id.

Signed-off-by: Xichen Pan xichen.pan@gmail.com

[xichen1]

Given the node id, it will only return the node status. API doc

Example response:

{
    "data": {
        "status": "running"
    },
    "msg": null,
    "status": "successful"
}