* feat(@angular/cli): Added support for multiselect list prompt
* If multiselect option is true use the checkbox
inquirer prompt type, otherwise use list.
* feat(@angular-devkit/core): Added support for multiselect list prompt
* Added multiselect to PromptDefinition interface and usages
At the moment, only kebab case args works, and this might be misleading if you come from the Angular CLI. As for instance `--dryRun` will have no effect.
Fixes#12599
Usage:
```
$ schematics @schematics/angular: --list-schematics
$ schematics --list-schematics
```
When no colon is specified, it means that that you are passing a schematic name to be looked up in the default collection.
Closes#12220