add systemd unit logging mode

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/log/mod.rs

@@ -2,14 +2,14 @@
 
 pub mod capture;
 pub mod color;
-mod console;
+pub mod console;
 pub mod fmt;
 pub mod fmt_span;
 mod reload;
 mod suppress;
 
 pub use capture::Capture;
-pub use console::ConsoleFormat;
+pub use console::{is_systemd_mode, ConsoleFormat, ConsoleWriter};
 pub use reload::{LogLevelReloadHandles, ReloadHandle};
 pub use suppress::Suppress;
 pub use tracing::Level;