fetchPackageMonthlyInstallCount = async function(packageName) {
  let resp = null;
  const source = CancelToken.source();
  setTimeout(() => {
    if (resp === null) source.cancel("ECONNTIMEOUT");
  }, 10000);
  resp = await AxiosService.create().get(
    urljoin(
      "https://package.openupm.com/downloads/point/last-month",
      packageName
    ),
    {
      headers: { Accept: "application/json" },
      cancelToken: source.token,
    }
  );
  return resp.data;
}
Fetch package meta json.
@param {string} packageName
@returns {Number}