Add aggregate convergence plot, averaging over benchmark problems

[mpetrosian]

To do:

• [ ] Add deviation plot with normalized runtime measure.

[codecov[bot]]

Codecov Report

Merging #439 (b314a3e) into main (01a4f9c) will increase coverage by 0.16%. The diff coverage is 98.72%.

@@            Coverage Diff             @@
##             main     #439      +/-   ##
==========================================
+ Coverage   92.87%   93.04%   +0.16%     
==========================================
  Files         234      244      +10     
  Lines       17596    18111     +515     
==========================================
+ Hits        16342    16851     +509     
- Misses       1254     1260       +6     

Impacted Files	Coverage Δ
...agic/optimization/tranquilo/thourough_subsolver.py	22.22% <0.00%> (-4.10%)	:arrow_down:
src/estimagic/visualization/profile_plot.py	90.24% <ø> (ø)
tests/optimization/tranquilo/test_adjust_radius.py	100.00% <ø> (ø)
src/estimagic/optimization/nag_optimizers.py	82.65% <33.33%> (-3.22%)	:arrow_down:
...imagic/optimization/tranquilo/tranquilo_history.py	77.55% <87.50%> (-1.24%)	:arrow_down:
src/estimagic/optimization/tranquilo/models.py	95.83% <96.55%> (-0.25%)	:arrow_down:
src/estimagic/optimization/tranquilo/tranquilo.py	97.18% <98.96%> (+0.67%)	:arrow_up:
...agic/optimization/tranquilo/acceptance_decision.py	100.00% <100.00%> (ø)
...c/optimization/tranquilo/acceptance_sample_size.py	100.00% <100.00%> (ø)
.../estimagic/optimization/tranquilo/adjust_radius.py	100.00% <100.00%> (ø)
... and 20 more

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