abstract duration parsing into utils

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

src/service/Cargo.toml

@@ -46,7 +46,6 @@ bytes.workspace = true
 conduit-core.workspace = true
 conduit-database.workspace = true
 const-str.workspace = true
-cyborgtime.workspace = true
 futures-util.workspace = true
 hickory-resolver.workspace = true
 http.workspace = true