Support `isAI` property on `CodeAction`

[StellaHuang95]

The Typescript team has added Copilot suggestions to various refactors in VS Code. To bring similar functionality to python code, Pylance has enabled the implement inherited abstract classes with Copilot code action through the Github Copilot extension for Python files.

To display the sparkle icon for the code action instead of the regular light bulb icon, the isAI property needs to be set to true on the codeAction.

LSP doesn't support this API yet. Would it be possible for LSP to support the codeActionAI proposed API?

Is it as simple as adding the conversion logic to asCodeAction in protocolConverter.js? I'd be happy to send a PR if that's all it takes. Thanks!

[dbaeumer]

There is actually more to it:

• we need to add this to the spec (https://github.com/microsoft/language-server-protocol)
• find a better name than isAI. May may be llmGenerated
• make this proposed in the spec since it is still proposed in VS Code

Happy to help if you want to work on a PR for here and https://github.com/microsoft/language-server-protocol

[StellaHuang95]

@dbaeumer I sent both PRs, let me know if you have any feedback. Thanks for the help😊

PRs are at:
#1557
microsoft/language-server-protocol#2020