[bisq-network/bisq] Validate phone numbers (#3149)

[Stan]

@ripcurlx I had incorrectly assumed this PR would be merged after approval, then GUI integration changes would go in another PR.  (Why did I think that?  I thought breaking the work into smaller chunks is what Bisq wants, and it is how I like to work with git.)  

If that's not the case, will I need to squash the new GUI side commits to this branch into one, or leave them as is, two commits in this PR?  (Two commits:  the one you just tested, and the commit containing the GUI integration to be added. )

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