IChatTask can't be serialized

[roblourens]

IChatTask:

vscode/src/vs/workbench/api/browser/mainThreadChatAgents2.ts

Line 42 in 93a7382

class MainThreadChatTask implements IChatTask {

is a class with methods that don't get serialized, so the interface is inaccurate after reloading the window, and that caused some issues while trying to refactor things. We should figure out how to set this up so that the types are correct after it's deserialized. Maybe we can push a full object with methods to the model, but when reading the chat response value, you get a different simpler interface. Or maybe we need some custom deserialization logic for some types.