Pull some year-generic code out of y2022 localizer

Pull out some utilities that I want to re-use in 2023.

Change-Id: I5cd03e942708d240441b8356f37eed029e0d8710
Signed-off-by: James Kuszmaul <jabukuszmaul+collab@gmail.com>
diff --git a/frc971/control_loops/drivetrain/BUILD b/frc971/control_loops/drivetrain/BUILD
index 86c1ec0..7e0500e 100644
--- a/frc971/control_loops/drivetrain/BUILD
+++ b/frc971/control_loops/drivetrain/BUILD
@@ -831,3 +831,17 @@
         "//aos/network/www:proxy",
     ],
 )
+
+cc_library(
+    name = "localization_utils",
+    srcs = ["localization_utils.cc"],
+    hdrs = ["localization_utils.h"],
+    deps = [
+        ":drivetrain_output_fbs",
+        "//aos/events:event_loop",
+        "//aos/network:message_bridge_server_fbs",
+        "//frc971/input:joystick_state_fbs",
+        "//frc971/vision:calibration_fbs",
+        "@org_tuxfamily_eigen//:eigen",
+    ],
+)