Backport #3130 Add foldMapA to foldable

[gagandeepkalra]

addresses #3143

[codecov-io]

Codecov Report

Merging #3351 into scala_2.11 will increase coverage by 0.02%.
The diff coverage is 100%.

@@              Coverage Diff               @@
##           scala_2.11    #3351      +/-   ##
==============================================
+ Coverage       93.39%   93.42%   +0.02%     
==============================================
  Files             389      389              
  Lines            7282     7295      +13     
  Branches          191      186       -5     
==============================================
+ Hits             6801     6815      +14     
+ Misses            481      480       -1

Impacted Files	Coverage Δ
core/src/main/scala/cats/syntax/foldable.scala	100% <100%> (ø)	⬆️
core/src/main/scala/cats/instances/queue.scala	100% <0%> (ø)	⬆️
core/src/main/scala/cats/data/NonEmptyList.scala	99.35% <0%> (+0.64%)	⬆️

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[travisbrown]

Hi @gagandeepkalra! I've just merged six of these backport PRs following the policy change in #3354, but these last four (#3351, #3340, #3334, #3292) have conflicts. Do you mind resolving? I'll go ahead and update the general #3143 checklist.

Thanks again for taking care of these!