solver3: Use zstd-compressed, base64-encoded dumps

Store the solver dumps with zstd compression and base64-encode
them in the crash report; such that they take up significantly
less space and can fit in cassandra's schema.

Base64 is wrapped at 76 characters as the base64 tool does. Do
some magic std::string_view conversion to avoid string copies
for the substr() used to get 76 characters at a time.

Note we can rely on substr(i, 76) to handle less than 76 characters
just fine; it uses std::min(76, size() - i) characters.

0 files changed, 0 insertions, 0 deletions