wip: generalized llm client

[arihanv]

why

Allow users to easily define their own llm clients rather than adding support for each major provider in the main codebase #350

what changed

• Refactored LLMProvider and LLMClient to allow custom clients to be passed in rather than directly imported.
• Types for model name and options generalized in order to support arbitrary clients

[changeset-bot]

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Latest commit: af1f3ad

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