chore(): update schema object interface

[Tony133]

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
[x] Other... Please describe:

What is the current behavior?

Issue Number: #1125

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

This PR, added enumName in SchemaObject, because it is missing( see issue #1125)

[kamilmysliwiec]

This is not how this issue is supposed to be fixed. You changed the OpenAPI interface, but there's a missing functionality (not implemented) in the code itself.