refactor: move lib/policy/config to lib/config

Signed-off-by: Xe Iaso <me@xeiaso.net>

lib/config/testdata/bad/thresholds.yaml

@@ -0,0 +1,15 @@
+bots:
+  - name: simple-weight-adjust
+    action: WEIGH
+    user_agent_regex: Mozilla
+    weight:
+      adjust: 5
+
+thresholds:
+  - name: extreme-suspicion
+    expression: "true"
+    action: WEIGH
+    challenge:
+      algorithm: fast
+      difficulty: 4
+      report_as: 4