fix: allow subTypes.name to be a number in DiscriminatorDescriptor

[nesro]

Description

Fixes https://github.com/typestack/class-transformer/issues/737 as it is a small fix, but very useful and needed. It allows subTypes.name to be a number as well - useful when discriminating with a version property for example.

Checklist

• [ x] the pull request title describes what this PR does (not a vague title like Update index.md)
• [ x] the pull request targets the default branch of the repository (develop)
• [ x] the code follows the established code style of the repository
  • npm run prettier:check passes
  • npm run lint:check passes
• [ ] tests are added for the changes I made (if any source code was modified)
• [ ] documentation added or updated
• [ ] I have run the project locally and verified that there are no errors

I did not edit the documentation as it doesn't mention the string type so it being a number is fine.

Fixes

fixes #737

[github-actions[bot]]

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