build/analysis: enable importsort, reformat

Change-Id: I64fd8803264138e02d016d4751bc23bc56a02521
Reviewed-on: https://review.monogon.dev/c/monogon/+/495
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
Reviewed-by: Mateusz Zalega <mateusz@monogon.tech>
Reviewed-by: Leopold Schabel <leo@nexantic.com>
diff --git a/build/analysis/nogo_config.json b/build/analysis/nogo_config.json
index e7f1f04..6da3a03 100644
--- a/build/analysis/nogo_config.json
+++ b/build/analysis/nogo_config.json
@@ -88,5 +88,10 @@
     "exclude_files": {
       "external/": "third_party"
     }
+  },
+  "importsort": {
+    "exclude_files": {
+      "external/": "third_party"
+    }
   }
 }