Add MiniMax provider routing

[octo-patch]

Reason: Add MiniMax provider support so the LLM provider registry can route MiniMax-M3 and MiniMax-M2.7 models.

Added a MiniMax registry alias backed by the OpenAI-compatible provider implementation.

Checks: pytest libs/giskard-llm/tests/test_routing.py -q

[gemini-code-assist]

Code Review

This pull request adds support for routing MiniMax models by registering 'minimax' in the provider registry and adding corresponding unit tests. The reviewer pointed out a critical issue where using the generic OpenAIProvider directly for MiniMax will incorrectly default to OpenAI's base URL and API key. They suggested creating a dedicated MiniMaxProvider subclass to properly handle MiniMax-specific configurations.

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[gemini-code-assist]

Using OpenAIProvider directly for minimax without explicit configuration will cause it to default to OpenAI's base URL (https://api.openai.com/v1) and look for OPENAI_API_KEY in the environment. This means unconfigured routing for minimax/* models will fail or incorrectly target OpenAI endpoints.

To fix this, we should define a MiniMaxProvider subclass in libs/giskard-llm/src/giskard/llm/providers/openai.py that defaults to the MiniMax base URL (https://api.minimax.chat/v1) and looks up MINIMAX_API_KEY from the environment if not explicitly provided.

For example, in libs/giskard-llm/src/giskard/llm/providers/openai.py:

class MiniMaxProvider(OpenAIProvider):
    _PROVIDER = "minimax"

    def __init__(
        self, 
        api_key: str | None = None, 
        base_url: str | None = None, 
        **kwargs: Any
    ) -> None:
        import os
        api_key = api_key or os.environ.get("MINIMAX_API_KEY")
        base_url = base_url or "https://api.minimax.chat/v1"
        super().__init__(api_key=api_key, base_url=base_url, **kwargs)

Suggested change

	"minimax": ("giskard.llm.providers.openai", "OpenAIProvider"),
	"minimax": ("giskard.llm.providers.openai", "MiniMaxProvider"),

[davidberenstein1957]

MiniMax provider routing looks good.