TBOX-282: fix version decorator to preserve function signature

[skalish]

↪️ Pull Request

✔️ PR Todo

• Add documentation
• Add examples
• Ensure you are following the practices in the contributor guide and coding_standards
  • Use consistent and descriptive name conventions
  • Uses google-style docstrings
  • Uses versioned API/client methods only
  • Avoid global variables
  • Avoid giant try/catch
  • Don't use mutable default variables
  • Use a main() function in your scripts
• Added/updated testing for this change (ensure you are testing any changes/new code!)
• Update title to link to TBOX issue (i.e. start pull request title with TBOX-xx)
• Approval from first code-reviewer
• Approval from second code-reviewer (only required if a second reviewer has left comments)
• Pass all checks

[Kovacsova]

LGTM