Revert "Remove null bytes in text"

This reverts commit 77d0c8fee993f293232c07dd81a6130ab6a68f5b.
Add util.Textify, which permissively turns Strings and Bytes into "text".

[refs #63726928]
Textify PDF input. [refs #63726928]
Textify DocumentCloud Strings. [refs #63726928]
Upgrade BoneCP and Guava
Textify CSV input. [finishes #63726928]
Avoid warning (and CPU usage) when trying to log SQL statements.

In our test environment, we configure BoneCP's log level higher than
debug. But BoneCP issues a warning if we call .setLogStatements(true) in
that case.