Add phone number validations for strings representing US phone numbers

[jdegoes]

ISSUE

There is no constructor for zio.schema.validation.Validation which can validate a US phone number.

SOLUTION

Using other constructors which already exist in zio.schema.validation.Validation (which include regex validation, string length checking, and numeric range checking), introduce a new constructor that satisfies the requirements of this issue.

object Validation {
  ...
  val phoneNumberUS: Validation[String] = ???
}

IMPACT

Increasing the number of constructors for Validation will make it far easier to use the validation package to

WHERE TO LOOK

• Schema validation

PROBLEMATIC ISSUES

Issue #248 must be completed first, or at least, this issue must be based off of #244.

[jadireddi]

Would like to contribute.