Add example for plotting with plots.jl

[TheFibonacciEffect]

Show how the PointEvalHandler can be used to evaluate the solution for plotting using Plots.jl in the case of the heat uquation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (43db37c) to head (b9e67df).

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HEAD has 5 uploads less than BASE

Flag	BASE (43db37c)	HEAD (b9e67df)
	6	1

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #1134       +/-   ##
==========================================
- Coverage   93.59%   0.00%   -93.60%     
==========================================
  Files          39      39               
  Lines        6087    6009       -78     
==========================================
- Hits         5697       0     -5697     
- Misses        390    6009     +5619     

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