Generate IBAN and other bank account identifiers

[mercxry]

Hello, I need to generate some IBANs for testing purposes, I've noticed that this crate unfortunately doesn't have this capability, would you be open to PRs to add this?

If so what about other bank account identifiers like SCAN (used in the UK), NRB (used in Poland), etc.. would these be accepted as well?

[cksac]

hi @mercxry, PR is welcome