Add a counter for total solves

[odow]

No description provided.

[codecov]

Codecov Report

Merging #301 into master will increase coverage by 0.46%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #301      +/-   ##
==========================================
+ Coverage   93.68%   94.14%   +0.46%     
==========================================
  Files          20       20              
  Lines        1694     1691       -3     
==========================================
+ Hits         1587     1592       +5     
+ Misses        107       99       -8

Impacted Files	Coverage Δ
src/plugins/parallel_schemes.jl	96.34% <ø> (+1.21%)	⬆️
src/user_interface.jl	98.38% <ø> (ø)	⬆️
src/deterministic_equivalent.jl	99% <ø> (+0.98%)	⬆️
src/print.jl	94.94% <100%> (+0.05%)	⬆️
src/algorithm.jl	98.11% <100%> (+0.01%)	⬆️
src/visualization/value_functions.jl	82.81% <100%> (+3.7%)	⬆️

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