copilot: Display cost multiplier for Github Copilot models #44800
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Description
Display cost multiplier for GitHub Copilot models in the model selectors (Both in Chat Panel and Inline Assistant)
Some technical notes
Although this PR's primary intent is to show the cost multiplier for GitHub Copilot models alone, I have included some necessary plumbing to allow specifying costs for other providers in future. I have introduced an enum called
LanguageModelCostInfofor showing cost in different ways for different models. Now, this enum is used inLanguageModeltrait to get the cost info.For now to begin with, in
LanguageModelCostInfo, I have specified two ways of pricing: Request-based (1 Agent request - GitHub Copilot uses this) and Token-based (1M Input tokens / 1M Output tokens). I had initially thought about adding aFreetype, especially for Ollama but didn't do it after realizing that Ollama has paid plans.Release Notes: