[Feature] Loop Activity

[totally-not-frito-lays]

Learning Goals
Currently our act3-functions example has a few loops but we don't have an activity or examples to introduce them. Come up with some set of activities for this!

Describe the solution you'd like
Our example should demonstrate the usage of loops in an engaging way. Feel free to use or rework some examples. You are encouraged to additionally come up with fancier loop examples using other programming concepts / constructs like conditionals or randomness. Be cognizant of changes from codewithher/CC-Library-Lantern#15.

Requirements

• Create loops/loops.ino
• Demonstrates different use cases for for/while loops (ie. repeating task, iterating through array, iterating until a specific value)
• Dedicated example / activity for the current uses of loops inside act3
• (OPTIONAL) Advanced activity using other concepts too!
• Examples are distinct from simply packing everything inside of loop()
• Describe testing instructions in the PR (see [Feature] Color Wheel Activity / Gradient CC-Library-Lantern#14 (comment) for an example)

Additional context

• This project is more open-ended
• This project should also have a dedicated page inside of notion