feat: add custom configuration to pass it as constructor param for a CustomGuardrail

[IleAuxVaches]

Add dedicated configuration for custom GuardRail.

A proposition to add custom configuration to pass it as constructor param in dynamic instanciation of a CustomGuardrail, as has been done for others 'ENTERPRISE' guardrails implementations.
Permit to define a default global configuration in yaml to set default parameters for a custom guardrail.
Example :

guardrails:
  - guardrail_name: "my_custom_guardrail"
    litellm_params:
      default_on: true
      guardrail: my_guardrails.MyCustomGuardRail
      mode: pre_call  
      custom_config: 
        # add my custom global params for my MyCustomGuardRail
        param1: "blabla"
        param2: "blabla"
        param3: true

This PR follows a discussion with @superpoussin22,

Type

🆕 New Feature

Changes

• add option dict CustomConfigin litellm/litellm/types/guardrails.py L109.
• add input parameter custom_config=litellm_params["custom_config"]in dynamic construction of instance CustomGuardrailin litellm/litellm/proxy/guardrails/init_guardrails.py L155.

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Name	Status	Preview	Comments	Updated (UTC)
litellm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 6, 2025 8:27am

[ishaan-jaff]

please add a unit test for this