Redo challenge 11 with Coroutines.

[rajagennu]

In challenge 11, we have used generators to implement

for i in ../*/*py; do grep ^import $i|sed 's/import //g' ; done | sort | uniq -c | sort -nr

How about redoing same challenge with Coroutines ?

If interested, users can use below references.

1. Curious Course on Coroutines and Concurrency
2. Coroutines

[bbelderbos]

We have one Bite on coroutines so far: https://codechalleng.es/bites/search/coroutines/ - maybe nice to add this pipeline but if I remember correctly we did not use send there, how would the code look for this scenario?