Add Entry.elements property

[janosh]

36219e4 add property elements to Entry class
11ec642 use new Structure.elements and Composition.elements properties across pymatgen
fc21570 add test_elements in TestPDEntry and TestTransformedPDEntry

[codecov-commenter]

Codecov Report

❌ Patch coverage is 90.66667% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.57%. Comparing base (cfaecbd) to head (be8cc82).
⚠️ Report is 1604 commits behind head on master.

Files with missing lines	Patch %	Lines
pymatgen/analysis/chempot_diagram.py	66.66%	1 Missing ⚠️
pymatgen/analysis/structure_analyzer.py	66.66%	0 Missing and 1 partial ⚠️
pymatgen/apps/battery/battery_abc.py	50.00%	1 Missing ⚠️
pymatgen/electronic_structure/plotter.py	85.71%	0 Missing and 1 partial ⚠️
pymatgen/entries/entry_tools.py	0.00%	1 Missing ⚠️
pymatgen/io/shengbte.py	0.00%	1 Missing ⚠️
pymatgen/vis/structure_vtk.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3226   +/-   ##
=======================================
  Coverage   74.57%   74.57%           
=======================================
  Files         230      230           
  Lines       69489    69493    +4     
  Branches    16168    16166    -2     
=======================================
+ Hits        51820    51825    +5     
  Misses      14595    14595           
+ Partials     3074     3073    -1     

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