Allow admin to ban keywords on proxy

[krrishdholakia]

Addresses - #2121

How to set this?

litellm_settings: 
     callbacks: ["banned_keywords"]
     banned_keywords_list: ["hello"] # can also be a .txt file - e.g.: `/relative/path/keywords.txt`

Test this

curl --location 'http://0.0.0.0:8000/chat/completions' \
--header 'Content-Type: application/json' \
--data ' {
      "model": "gpt-3.5-turbo",
      "messages": [
        {
          "role": "user",
          "content": "Hello world!"
        }
      ]
    }
'

[railway-app]

This PR was not deployed automatically as @krrishdholakia does not have access to the Railway project.

In order to get automatic PR deploys, please add @krrishdholakia to your team on Railway.

[railway-app]

This PR was not deployed automatically as @krrishdholakia does not have access to the Railway project.

In order to get automatic PR deploys, please add @krrishdholakia to your team on Railway.

[vercel]

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