Comment 1 for bug 2035396

Branch for testing: https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/dbriem/lp2035396_default_sms_phone_example_and_regex

I didn't mark this confirmed because I'm from Lindsay's system.

Adds new library settings to display an example or perform regex validation for the default and SMS phone fields on the patron registration and edit interfaces.

I was also going to let these fallback to the generic "Regex/Example for phone fields on patron registration" but as that could conceivably be a breaking change where systems could have many records where phone numbers would need to be updated when, say, updating expire dates for patrons, I thought maybe that should be another bug and not hold this up.