Add a function to reverse the order of content lines

[Aminkbi]

Add a ReverseLines function to the script library that reverses the order of lines in the input pipe. It’ll be useful in cases where users need to work with data starting from the end — for example, displaying the newest log entries first or processing recent records before older ones.

[bitfield]

Great suggestion, @Aminkbi! Shall we start by trying to write a program that shows how this feature would work for your use case? For example, if you're checking log entries for something, let's write that program, using Reverse as though it already existed, so that we can see what API would make sense.