[bisq-network/bisq] Integrate PhoneNumberValidator into HalCashForm (#3236)

[Stan]

According to [this EN site](https://affgambler.com/banking/halcash-casinos), recipients  _need a cell phone_ (not email), and access to any HalCash ATM in Spain or Poland.   Money can be sent across borders, is not deposited in the recipient's bank account, and  HalCash ATM withdrawal limits apply.

> To send money users should have a bank account with one of participating institutions. In this case they will need to provide phone number of the receiver, PIN code and specify how much money they want to send. Once all required information is sent, receiver gets an SMS telling a reference code. It takes few moments for money transfer to be processed, and withdrawal is possible just seconds later.

> After getting a message about money transfer, users should find closest HalCash ATM. There will be “Withdrawal without using a card” option on a display. Select it and then push HalCash button to find simple instructions you should follow. If you are trying to withdraw money, you’ll need to enter your phone number, transfer size, reference code and PIN code. The latter should be provided by a sender. If the information is accurate, you’ll receive cash.

According to this [HalCash FAQ](https://www.halcash.com/en/quienes-somos/), there are plans to add US ATM and POS systems to the network.





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