Deprecate stanalone mode and use os instead

[alesanchezr]

This is how the config.editor will look like:

• [ ] If the config.editor.agent is vscode the factory will return the VSCodeOperation object and the commands will be hablded using the queue.
• [ ] If the agent is not VSCode (probably null) then we focus on the config.editor.os property.
• [ ] Remove the "standalone" config.editor.mode because its deprecated, the only mode for now will be "preview".
• We should be agent aware and open files depending of the platform without using the extension in case that the agent is localhost

interface OSCommand {
public openExercise(slug: string) {

}
}

https://chat.openai.com/share/c81c7f8c-cb55-43c6-b833-c3b7b79b79f6

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