Add foldMapA1

[lrworth]

foldMapA is one of my favourite functions but it requires Monoid and I only have a Semigroup at the moment. I made this by copying foldMapA and updating it to suit. I couldn't get the doctests to run (CPP-related errors?)

Checklist:

HLint

• I've changed the exposed interface (add new reexports, remove reexports, rename reexported things, etc.).
  • I've updated hlint.dhall accordingly to my changes (add new rules for the new imports, remove old ones, when they are outdated, etc.).
  • I've generated the new .hlint.yaml file (see this instructions).

General

• I've updated the CHANGELOG with the short description of my latest changes.
• All new and existing tests pass.
• I keep the code style used in the files I've changed (see style-guide for more details).
• I've used the stylish-haskell file.
• My change requires the documentation updates.
  • I've updated the documentation accordingly.
• I've added the [ci skip] text to the docs-only related commit's name.

[tomjaguarpaw]

FYI the Kowainik ecosystem sees very little activity. I personally work on emergency maintenance only, but you may find another maintainer who will review and accept a PR.