Add support for cqm problem type to dwave api client

[randomir]

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[codecov-commenter]

Codecov Report

Merging #491 (8d7fb75) into master (4dee3ce) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #491   +/-   ##
=======================================
  Coverage   86.15%   86.16%           
=======================================
  Files          24       24           
  Lines        3244     3245    +1     
=======================================
+ Hits         2795     2796    +1     
  Misses        449      449           

Impacted Files	Coverage Δ
dwave/cloud/api/constants.py	100.00% <100.00%> (ø)

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