feat: add support for generating commit message

[lkk214]

Description

Generate commit messages based on selected changes in the workflow UI.

• Analyze selected changes in the workflow UI and generate relevant descriptive commit messages
• Support switching between different LLMs, using config.modelsByRole.chat as the model list source

Screenshots

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[sestinj]

@lkk214 I like this a lot! If we add this in IntelliJ, do you think we could add it in VS Code as well? It can be bothersome when there isn't feature parity. Otherwise, I like what you did with the UI and whenever you've got the code in a closer spot I'd be happy to review

[nomagicln]

This is an incredible feature! I've been looking forward to it for quite some time. Will it be supported in VS Code?

[nomagicln]

@lkk214 I have a small suggestion: would it be possible to provide a method that allows users to specify the submission format?

[lkk214]

IntelliJ offers deeper integration, while VS Code has limited flexibility with its built-in SCM.
For VS Code, I’ll implement a simpler version that only generates commit messages.