Opt-in policies for OpenAI and MistralAI bots (#590)

* Define OpenAI bot ALLOW policies

Allows OpenAI bots to be allowlisted at the choice of the Anubis administrator. None are enabled by default.

* Define MistralAI bot ALLOW policy

* chore: spelling

data/clients/mistral-mistralai-user.yaml

@@ -0,0 +1,10 @@
+# Acts on behalf of user requests
+# https://docs.mistral.ai/robots/
+- name: mistral-mistralai-user
+  user_agent_regex: MistralAI-User/.+; \+https\://docs\.mistral\.ai/robots
+  action: ALLOW
+  # https://mistral.ai/mistralai-user-ips.json
+  remote_addresses: [
+    "20.240.160.161/32",
+    "20.240.160.1/32",
+  ]