fix(): fix clonePrimitiveLiteral result is undefined issue on Length decorator

[cantecim]

• fixes an issue adding minLength and maxLength properties when using Length with an expression

PR Checklist

Please check if your PR fulfills the following requirements:

• 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
• 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: N/A

plugin unable to add minLength and maxLength properties when @Length decorator used with an expression

What is the new behavior?

plugin is now able to add minLength and maxLength properties even when @Length decorator used with an expression

Does this PR introduce a breaking change?

• Yes
• No

Other information

[kamilmysliwiec]

LGTM