feat(): add directory option to the application schematic

[Sikora00]

nestjs/nest-cli#283

PR Checklist

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• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: nestjs/nest-cli#283

> nest new @scope/package

This command will generate application files inside the 'package' folder and additionally, it will put everything inside a wrapping folder '@scope'. Furthermore currently there is no option to generate the application to another directory than the same as the application name says.

What is the new behavior?

> nest new @scope/package --directory=scope-package

This command will produce new application inside scope-package/

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[kamilmysliwiec]

Thank you!