Phone link validation and display helpers?

[GuySartorelli]

I came across this while looking into the migration path from gorriecoe/silverstripe-link.

That module uses giggsey/libphonenumber-for-php to provide some template helpers for phone number formatting.

That library also provides some validation functionality and seems both very robust and well maintained.

Do we want to add one or both of:

1. Phone number formatting helpers
2. Phone number validation

[maxime-rainville]

My instinct would be to create an optional PhoneField and ship it an optional unsupported module. If there's legitimate interest in this, we can brig it back into core at a later date.

[GuySartorelli]

I would be hesitant to include an optional unsupported module as a dependency of a supported module...