Default user values for new user on SSO

[krrishdholakia]

Addresses - #2162

For any new SSO user, you can create default user params (default models they have access to, budget, etc.)

Any value in /user/new can be set as a default param in config

litellm_settings:
  default_user_params: 
         models: ["gemini-pro"]

cc: @Lunik

[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.

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