ロボット単位のアセットを取得するメソッドを追加

[masatomix]

GET https://xxx/odata/Assets/UiPath.Server.Configuration.OData.GetRobotAsset(robotId='99fcxxxx22',assetName=@assetName)?@assetName='Credential001' HTTP/1.1
Authorization: UiRobot 99fcxxxx22

{"@odata.context":"https://xxx/odata/$metadata#UiPath.Orchestrator.Application.Dto.Assets.RobotAssetDto","Name":"Credential001","ValueType":"Credential","StringValue":"","BoolValue":false,"IntValue":0,"CredentialUsername":"u000_kino","CredentialPassword":"p000_kino","ExternalName":null,"CredentialStoreId":1}