Missing diagnostic for debugger:autoInitialize()

[Ukendio]

Current behavior

Currently if you initialize the debugger after you have begun the loop it will silence error and the debugger will not popup when you toggle it.

Proposed improvement

We can expose a flag like loop.started and when :autoInitialize is called, we check if the passed loop has the flag enabled. If it is enabled, it should error with a message stating that it needs to be called before the loop begins.

Additional context

Someone in the roblox-ts server encountered this issue with Matter where they couldnt get the debugger up because they had initialized it after the loop started. Personally when I tried helping it took me a good few minutes to figure it out.