#5 Support upload multiple apks

Delete task: updateDeployGateDistribution
Change configuration format:

```
deploygate {
  token = "[token]
  userName = "[owner name]"

  apks {
    apk1 {
      sourceFile = file("[path1]")
      message = "[message1]"
      distributionKey = "[distribution_key1]"
      releaseNote = "[release notes1]"
    }
    apk2 {
      sourceFile = file("[path2]")
        message = "[message2]"
    }
  }
}

```