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.

tns run android の CLI 処理と、既存の --release およびデバッグ環境の選択から始めます。app.component.ts がどのように選択されるかを追跡し、続いて --environment=test が選択すべきものを定義します。app.component.test.ts を使用する例のコマンドで完了を示します。