Use enum class for DataSpace::DataspaceType.

[1uc]

See #899 for what the issue is and a safe alternative. Unfortunately, changing an enum to an enum class is a breaking change and can't be done until 3.0.0.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (066c188) 86.11% compared to head (a8eed46) 86.13%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #900      +/-   ##
==========================================
+ Coverage   86.11%   86.13%   +0.01%     
==========================================
  Files          90       90              
  Lines        5864     5872       +8     
==========================================
+ Hits         5050     5058       +8     
  Misses        814      814              

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