With this change the CLI offers a way for a package authors to specify if during `ng add` the package should be saved as a `dependencies`, `devDependencies` or not saved at all.
Such config needs to be specified in `package.json`
Example:
```json
"ng-add": {
"save": false
}
```
Possible values are;
- false - Don't add the package to `package.json`
- true - Add the package to the `dependencies`
- `dependencies` - Add the package to the `dependencies`
- `devDependencies` - Add the package to the `devDependencies`
Closes#12003 , closes#15764 and closes#13237
d133ba68c0