Add Codecov to Azure pipelines

[thomasrockhu]

Mirroring the work done here to see why Codecov is not getting reports

cc: @tylerjereddy

[tylerjereddy]

Thanks for checking this for us!

[codecov]

Codecov Report

Merging #2771 into develop will increase coverage by 1.09%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #2771      +/-   ##
===========================================
+ Coverage    91.08%   92.17%   +1.09%     
===========================================
  Files          177      183       +6     
  Lines        23655    23977     +322     
  Branches      3122     3090      -32     
===========================================
+ Hits         21545    22100     +555     
- Misses        1490     1812     +322     
+ Partials       620       65     -555     

Impacted Files	Coverage Δ
package/MDAnalysis/topology/tpr/obj.py	96.77% <0.00%> (-3.23%)	⬇️
...onality_reduction/DimensionalityReductionMethod.py	97.05% <0.00%> (-2.95%)	⬇️
analysis/__init__.py	100.00% <0.00%> (ø)
topology/__init__.py	100.00% <0.00%> (ø)
coordinates/__init__.py	100.00% <0.00%> (ø)
package/MDAnalysis/analysis/__init__.py	100.00% <0.00%> (ø)
package/MDAnalysis/topology/__init__.py	100.00% <0.00%> (ø)
package/MDAnalysis/analysis/hole2/hole.py	73.19% <0.00%> (ø)
package/MDAnalysis/coordinates/__init__.py	100.00% <0.00%> (ø)
package/MDAnalysis/analysis/hole.py
... and 93 more

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[orbeckst]

Closing because PR #2720 solved the problem.

Thank you @thomasrockhu !