Default to LTS Luau

[jf-06]

This issue talks about defaulting to default Luau code execution if no Roblox-specific lua features are detected (such as game, workspace etc.)

This system needs the following:
~ A way to execute Luau from within the process without relying on external processes.
~ A way to dynamically detect code that contains Roblox-specific functions, this will call for an additional utility class that notes down every case that is Roblox-specific, and will cache the hash for these scripts so that this check is reevaluated on every subsequent instance of it.