Code action intellisense in the keybindings JSON editor

[mjbvz]

Feature request

When creating a keybinding for a specific code action, such as:

	{
		"key": "shift+ctrl+e",
		"command": "editor.action.codeAction",
		"args": {
			"kind": "refactor.extract",
			"preferred": true
		}
	}

We should show intellisense for the args property and also intellisense for code action kind by leveraging the new contribution point from #82718

/cc @sandy081

[mjbvz]

@sandy081 Please take a look at the changes in 166f925. I added a new method in KeybindingService to support contributing a dynamic json schema for a command. This seemed like the clearest way to achieve this

[sandy081]

@alexandrudima owns this code and hence mentioning him.

[alexdima]

👍