feat: add support for phone number validation strategy

[fwoelffel]

Description

Checklist

• the pull request title describes what this PR does (not a vague title like Update index.md)
• the pull request targets the default branch of the repository (develop)
• 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

Fixes

fixes #939

[NoNameProvided]

Thanks for opening this PR, but this won't get merged.

I don't think the pros outweigh the cons:

• I believe the vast majority of validation use cases check for valid phone numbers only
• it introduces a custom option that doesn't exist in the source lib and I prefer having all validators run with as little custom config as possible
• we actually changed to check for letters in phone numbers and fail the check and this is not possible with this approach

If you need this you can always create a custom decorator and use that.

[github-actions]

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