Expose the municipality behind a not-found CEPHEADv0.2.0main

A CEP that fails a lookup is rarely random: it is usually someone who
knows the city and guessed the number, and the classic guess is the -000
that 957 municipalities never received. The API now names, on the 404
itself, the municipality that CEP would have belonged to, so a caller can
say "not found — did you mean somewhere in Areal/RJ?" instead of just
"not found".

CepNotFound carries it as an optional Faixa. It stays an error: the block
is context, not an address, and the range it describes is sparse, which
is why it reports a count alongside the first and last CEP that actually
exist there rather than the bounds the Correios publish. Parsing it is
best-effort on purpose — a missing, empty or malformed block leaves the
optional empty, since a 404 is already the answer and reading the hint
attached to it must never cost the diagnosis.

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