feat: basedir option added to configuration for generate command

[yigitkurtcu]

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:

Issue Number: #1849

What is the new behavior?

Added a new option "baseDir". With this new option, new files related to this directory will be created and imported to the app module.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

[micalevisk]

looks like we need to fix our CI