angular
refactor(@angular/cli): provide default serve target for applications
The serve command will now use a default project target and builder name if the target entry is not explicitly defined. This allows the removal of additional configuration from an angular.json file. If the target is already present than it will take priority over any default builder behavior. The default logic will use the appropriate development server builder for officially supported packages (@angular/build/@angular-devkit/build-angular). The dev-server builder from these packages will currently assume a development configuration is present within the build target. The default behavior may be expanded in the future to support more arbitrary build target configurations. If there is third-party package usage within the build target, the CLI will attempt to discover a dev-server builder within the same package used by the build target. If none is found, no default will be added and the serve command will issue an error when no explicit target is present.
