`plainToInstance` support

[chriskuech]

Is there an existing issue that is already proposing this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe it

plainToClass is incorrectly named. class-transformer has since provided a properly named plainToInstance function with seemingly identical interface. Please pull in this change from upstream.

Describe the solution you'd like

Pull in plainToInstance from upstream class-transformer repo

Teachability, documentation, adoption, migration strategy

Identically to plainToClass but plainToInstance.

What is the motivation / use case for changing the behavior?

• Accuracy of function names
• Minimize difference between class-transformer and @nestjs/class-transformer
• This bug means we need to blacklist class-transformer from our imports, which means either @nestjs/class-transformer updates to include the correct interface or we revert to the inaccurate interface