Create `cpf-cd` (check digits)

[juliolmuller]

Create a new package cpf-cd to calculate check digits (dígitos verificadores) for CPF. Although the logic of calculating these numbers are already implemented inside cpf-gen, these should be removed from that in the next major version in favor of this package.

• Create a class CpfCheckDigits to lazyly calculate first and second checkdigits. The base CPF for the calculation should be passed to the constructor and validated accordingly:
  • CPF provided should have between 9 and 11 digits after sanitization. Throw exception if not met.
  • Repeated sequences of digits (e.g. 111.111.111-*, 222.222.222-*, 333.333.333-* nad so on) are considered invalid CPF's, so the input of these value should throw an exception.
  • CPF should be provided as string, list of strings or list of integers.
• All errors thrown by the package should be custom, prefixed with CpfCheckDigits*TypeError for type errors and CpfCheckDigits*Exception for other exceptions.