Better traceback for lua coroutines

[audinowho]

We can trace lua code when it's not in a coroutine just fine.
We can also trace C# code when it is in a coroutine due to having control over the coroutine system.
We need to be able to trace the insides of the lua coroutine due to its extensive use in scripting.

Relevant links:
https://github.com/NLua/NLua/blob/2c8a3555b93a6ab054479615237ac08c843ee7ec/src/Lua.cs#L214
https://zeux.io/2010/11/07/lua-callstack-with-c-debugger/
https://devforum.roblox.com/t/coroutinewrap-function-with-full-error-stack-traces/507738
https://github.com/Partixel/R-CoroutineErrorHandling