✨ (concepts) Add concept exercise `annalyns-infiltration`

[devkabiir]

This concept is inspired from the same in csharp track

[senekor]

The author of this PR has stopped responding in the discussions planning the work on the syllabus. But there's been a lot of work put into reviews already, so I'm keeping it open in case it can be salvaged in a future attempt to create a good syllabus.

[ErikSchierboom]

For the record, I'd like to state that pacman-rules is usually the better choice to teach booleans and boolean expressions.