feat(proxy_server.py): add CRUD endpoints for 'end_user' management

[krrishdholakia]

Title

allow admin to specify region + default models for end users

Relevant issues

Closes #3524

curl --location 'http://0.0.0.0:4000/end_user/new' \
--header 'Authorization: Bearer sk-1234' \ # 👈 Master Key
--header 'Content-Type: application/json' \
--data '{
      "end_user_id" : "ishaan-jaff-3", <- specific customer
    
    "allowed_region": "eu" <- set region for models        

             + 

    "default_model": "azure/gpt-3.5-turbo-eu" <- all calls from this user, use this model? 

}'

# return end-user object

Type

🆕 New Feature

Changes

• proxy_server.py
• routing.py

Testing

• add testing for /end_user/new + /end_user/info

Pre-Submission Checklist (optional but appreciated):

• I have included relevant documentation updates (stored in /docs/my-website)

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Name	Status	Preview	Comments	Updated (UTC)
litellm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 9, 2024 5:20am