[V3] Add Concept Exercise: While and Switch

[junedev]

Addresses #991

Notes

• Although there was no final decision yet (https://exercism-team.slack.com/archives/CR91YFNG3/p1616872980114600), I removed the alcohol from the original exercise to be on the save side.
• The introduction includes break and continue because I find them essential to the concept. But currently you could solve the exercise without them. I didn't want to delay getting this ready by making up another task for this. I left a note in the design.md file that this would be a good addition.
• I had use a prettier ignore directive for the switch statement in the docs because it was indenting the comment below the default statement the wrong way.
• CI is failing because of a configlet update but the errors are not related to the new exercise. Resolved

[tejasbubane]

Minor suggestions.

[SleeplessByte]

This is looking great. As with all the while/loop/switch exercises in other languages, this one suffers that if you know recursion / if you know difficult / complex map reduces, it will be easier to solve that way, but I really like how you've made it likely enough that someone will solve this the intended way.

Analyzers will do their job here. We can have analyzers (as per your design document) shout if a while etc. is not used, so I think we can cover our cases there!

[junedev]

Thanks for the reviews! One open question: #1073 (comment), all the other things are fixed. I also fixed all the code comments that were real sentences to be written as such (first letter capitalized, period at the end).

[SleeplessByte]

Sweeet. Very nice. I've also answered the final open question.

[junedev]

From my point of view this is now ready to be merged.