Add phone number validations for European countries

[jdegoes]

ISSUE

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

NOTE: This is 50 tickets in one. Please signup for one or more of the tickets by checking them below.

• [ ] Albania
• [ ] Andorra
• [ ] Armenia
• [ ] Austria
• [ ] Azerbaijan
• [ ] Belarus
• [ ] Belgium
• [ ] Bosnia and Herzegovina
• [ ] Bulgaria
• [ ] Croatia
• [ ] Cyprus
• [ ] Czechia
• [ ] Denmark
• [ ] Estonia
• [ ] Finland
• [ ] France
• [ ] Georgia
• [ ] Germany
• [ ] Greece
• [ ] Hungary
• [ ] Iceland
• [ ] Ireland
• [ ] Italy
• [ ] Kazakhstan
• [ ] Kosovo
• [ ] Latvia
• [ ] Liechtenstein
• [ ] Lithuania
• [ ] Luxembourg
• [ ] Malta
• [ ] Moldova
• [ ] Monaco
• [ ] Montenegro
• [ ] Netherlands
• [ ] North Macedonia
• [ ] Norway
• [ ] Poland
• [ ] Portugal
• [ ] Romania
• [ ] Russia
• [ ] San Marino
• [ ] Serbia
• [ ] Slovakia
• [ ] Slovenia
• [ ] Spain
• [ ] Sweden
• [ ] Switzerland
• [ ] Turkey
• [ ] Ukraine
• [ ] Vatican City (Holy See)

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 phoneNumber<2-Letter CountryCode>: 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.

[BalduinLandolt]

I'll try to get that one started by implementing Switzerland, but once I got the hang of it, I can continue with other countries too.

[marioaae]

I'll try to get into this as well and will start with Germany.

[BalduinLandolt]

@marioaae should we pair up, maybe? If you want to, just ping me on discord (I posted in the zio-schema channel, so you should easily be able to find me)

[subotic]

I will try Serbia.

[lmserrano]

I will try Portugal.

[tewecske]

I will do Hungary.

[jdegoes]

This ticket needs to be updated to reflect which validators have already been implemented, and which remain.

[BalduinLandolt]

I can't update the initial task, but I went through the list: all of the validations (and many more) are done, so this issue can be closed, I suppose.
(Only thing I noticed, in the comment the republic of North Macedonia is referred to as the republic of Macedonia, which isn't the official name any more.)