Contextual Logging

Is your feature request related to a problem? Please describe.
There are some command specific messages that look strange both when the NativeScript CLI is used as a library and from the command line. For example, take a look at this change.

Describe the solution you'd like
A possible solution is defining an error object instead of using strings. The object could contain something like a CLI specific message and the logger could handle the error messages based on the current CLI usage.

先檢視 PR #4063 中變更的檔案，並追蹤 NativeScript CLI 從命令列執行與作為 library 執行時，命令特定的訊息如何傳遞到 logger。依照 issue 中的描述，當針對這兩種使用模式分別以不同方式表示與處理內容相關的錯誤訊息時，即視為完成。