Add UI settings for AI Copilot customization

[yada]

Reason/Context

We need this improvement to provide users an easier way to configure and customize AI Copilot parameters directly from the UI. This will improve usability and flexibility by allowing users to adjust settings such as model selection, timeout, and token limits without modifying configuration files manually (which is, BTW, not possible as settings are overwritten on startup).

Description

Add new fields in the AI Copilot settings UI to support the customization of the following parameters:

• ai-copilot.openai.model (e.g., gpt-4-turbo-preview)
• ai-copilot.openai.timeout (e.g., 360)
• ai-copilot.openai.maxTokens (e.g., 60000)

These settings will not introduce breaking changes but enhance user control over Copilot behavior.

Implementation ideas

• Add input fields in the AI Copilot UI for model selection, timeout, and maxTokens.
• Provide sensible default values for timeout and maxTokens.
• Populate model options dynamically using OpenAI's model listing: OpenAI Models Documentation or refer to it.

[github-actions]

👋 @yada

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[yada]

@hguerrero What do you think about it?