Try to implement a Go like defer statement

[dibyendumajumdar]

Recently Roberto has been working on toclose variables in Lua 5.4. Lots of debate on the list around this.

I would like to try out something similar but slightly different.

Main idea is to use the luaF_close() way of handling upvalue closure but actually have a separate list of deferred functions. Provide an API to add a function to the list of deferred functions.

Might need a new opcode because we need to reserve stack slots at compile time.