This commit fixes a potential denial of service
vulnerability in logrus.Writer() that could be
triggered by logging text longer than 64KB
without newlines. Previously, the bufio.Scanner
used by Writer() would hang indefinitely when
reading such text without newlines, causing the
application to become unresponsive.
This commit adds a variant of the logger's Writer() function that
accepts a log level. When the variant is used, any messages written to
the returned pipe will be written with the provided level. The original
Writer() function uses the logger's Print() method as it always has.