various plotting fixes

[andre-merzky]

• fix string conversion in to_latex which previously stumbled over label types
• support plotting for more than one entity type (to include raptor master and workers)
• simplify some type checking

[codecov[bot]]

Codecov Report

Merging #158 (ba16d8f) into devel (b76fc85) will decrease coverage by 1.94%. The diff coverage is 13.36%.

@@            Coverage Diff             @@
##            devel     #158      +/-   ##
==========================================
- Coverage   24.78%   22.83%   -1.95%     
==========================================
  Files           7        7              
  Lines         940     1099     +159     
==========================================
+ Hits          233      251      +18     
- Misses        707      848     +141     

Impacted Files	Coverage Δ
src/radical/analytics/session.py	6.67% <5.55%> (+0.03%)	:arrow_up:
src/radical/analytics/utils/plot.py	8.92% <6.57%> (-22.33%)	:arrow_down:
src/radical/analytics/experiment.py	25.92% <50.00%> (ø)
src/radical/analytics/entity.py	74.41% <60.00%> (-0.47%)	:arrow_down:
src/radical/analytics/__init__.py	100.00% <100.00%> (ø)
src/radical/analytics/utils/__init__.py	100.00% <100.00%> (ø)

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