news: added news file

Signed-off-by: Balazs Scheidler <bazsi77@gmail.com>

news/feature-4091.md

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+`log-level()`: added a new global option to control syslog-ng's own internal
+log level.  This augments the existing support for doing the same via the
+command line (via -d, -v and -t options) and via syslog-ng-ctl.  This change
+also causes higher log-levels to include messages from lower log-levels,
+e.g.  "trace" also implies "debug" and "verbose".  By adding this capability
+to the configuration, it becomes easier to control logging in containerized
+environments where changing command line options is more challenging.
+
+`syslog-ng-ctl log-level`: this new subcommand in syslog-ng-ctl allows
+setting the log level in a more intuitive way, compared to the existing
+`syslog-ng-ctl verbose|debug|trace -s` syntax.
+
+`syslog-ng --log-level`: this new command line option for the syslog-ng
+main binary allows you to set the desired log-level similar to how you
+can control it from the configuration or through `syslog-ng-ctl`.