Return disputes and dispute counts in the search results

[kyungmin]

Searching by dispute ID doesn't return the dispute item in the search results. API should return disputes along with dispute counts in the search results.

{
...
    "counts": {
      ...
      "order": 0,
      "bank_account": 0,
      "dispute": 0,  //  add this field
    },
    "total": 0,
}

[kyungmin]

We need to count total disputes that "need attention", not "submitted".