Added stricter controls over the returned values by the datasource.

Created by: stefanoborini

The datasource must return a list of DataValues. This PR enforces the types of both the returned entity and its content.

Created by: codecov[bot]

Codecov Report

Merging #155 into master will increase coverage by 0.08%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #155      +/-   ##
==========================================
+ Coverage   91.87%   91.95%   +0.08%     
==========================================
  Files          38       38              
  Lines         972      982      +10     
  Branches       56       59       +3     
==========================================
+ Hits          893      903      +10     
  Misses         75       75              
  Partials        4        4

Impacted Files	Coverage Δ
force_bdss/core_evaluation_driver.py	90.9% <100%> (+1.02%)

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