Expose the faixa a missing CEP would have belonged toHEADv0.2.0main

A CEP that fails is rarely a random number: it is someone who knows the
city and guessed the digits, and the classic guess is the -000 that 957
municipalities never received. The API now attaches that municipality to
the 404, and a caller left with nothing but "does not exist" cannot tell
a typo in a real city from a CEP that was never plausible.

It goes in CEPIS-STATUS, not CEPIS-ADDRESS. The call has still failed
and the address is still empty; putting a localidade where the address
lives would let a caller that forgets to test the status read Areal as
the answer to a CEP that does not exist.

Parsing is best effort throughout. faixa is omitted rather than sent as
null for a band no municipality owns, so its absence is the normal case
and there is a flag instead of a marker value; a block that is missing,
is not an object, or is short of localidade, uf, cep_ini, cep_fim and
ceps is dropped and the not-found comes back clean. Failing a 404 the
caller already understands over a decoration on it would be a poor
trade.

cep_ini and cep_fim are the CEPs that exist, not the bounds the Correios
publish, and the span between them is mostly empty -- hence ceps beside
them, so the pair is not read as a list.

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