Request: Support environments other than release and debug

Currently, there are two supported environments, release and debug. The default is debug and "--release" can be used to build a release version of the app. It would be useful to have other environments, so I was wondering if it would be possible to add an "--environment" flag be allowed to specify these.

For example, "tns run android --environment=test" would use the file app.component.test.ts.

從 tns run android 的 CLI 處理以及現有的 --release 和偵錯環境選擇開始。追蹤 app.component.ts 的選擇方式，然後定義 --environment=test 必須選擇什麼，並透過使用 app.component.test.ts 的範例命令展示完成情況。