Update wrap functions to handle error unions

[natecraddock]

It would sometimes be useful to use try in a wrapped zig function and have that propagate as a Lua error. This should be pretty easy to do with comptime

[VisenDev]

My implementation of autoPushFunction automatically does this.

                if (@typeInfo(info.Fn.return_type.?) == .ErrorUnion) {
                    const result = @call(.auto, function, parameters) catch |err| {
                        lua.raiseErrorStr(@errorName(err), .{});
                    };
                    lua.pushAny(result);
                } else {
                    const result = @call(.auto, function, parameters);
                    lua.pushAny(result);
                }