linters: add httpstatus linter

.golangci.yaml

@@ -28,6 +28,7 @@ linters:
     # Custom linters
     - ifinit
     - boolnames
+    - httpstatus
 
   settings:
     custom:
@@ -37,6 +38,9 @@ linters:
       boolnames:
         type: module
         description: boolean variables and functions should use "is", "has", "was" etc
+      httpstatus:
+        type: module
+        description: HTTP status codes should use the project's typical-code policy
     forbidigo:
       forbid:
         - pattern: ^sync\.Map$