Add reasoning_effort field to LLMClientCompletionRequest

[devin-ai-integration]

Add reasoning_effort field to LLMClientCompletionRequest

This PR adds a new field called reasoning_effort to the LLMClientCompletionRequest struct, which can be set to Low, Medium, or High. The field is implemented as an enum ReasoningEffort with these three variants.

Changes

• Added ReasoningEffort enum with Low, Medium, and High variants
• Added reasoning_effort: Option<ReasoningEffort> field to LLMClientCompletionRequest struct
• Added accessor methods set_reasoning_effort() and reasoning_effort() to the struct
• Updated OpenAI client to use this field when making API requests
• Updated OpenAICompatibleClient to support this field (which is used by Groq client)

Testing

• Verified changes compile with cargo check

Link to Devin run: https://app.devin.ai/sessions/6a150dd326c541b7b99bf113e9ff6c5a
Requested by: Sandeep Kumar Pani (skcd@codestory.ai)

[devin-ai-integration]

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[devin-ai-integration]

Closing due to inactivity for more than 7 days.