change(isMobilePhone): updated locale typing to better reflect ValidatorJS functionality

[kurbar]

Description

Updated typings for IsMobilePhone decorator usage to better reflect of the actual functionality of ValidatorJS's validation.

Notable changes:

• support setting locale as "any" to validate against any locale.
• allow locale to be an array of locales to validate against multiple locales.

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
• [X] tests are added for the changes I made (if any source code was modified)
• [X] documentation added or updated
• [X] I have run the project locally and verified that there are no errors

Fixes

fixes #2489