Add back proto-lens-*

[judah]

New versions have been released to Hackage which build against stack-nightly.

Also remove proto-lens-descriptors which was merged into proto-lens.

Checklist:

• Meaningful commit message - please not Update build-constraints.yml

• At least 30 minutes have passed since Hackage upload

• On your own machine, in a new directory, you have successfully run the following set of commands (replace $package with the name of the package that is submitted, $version is the version of the package you want to get into Stackage):

  stack unpack $package-$version
  cd $package-$version
  stack init --resolver nightly
  stack build --resolver nightly --haddock --test --bench --no-run-benchmarks