Script to plot divergence heatmap

[AdamGleave]

• Adds a CLI script to plot heatmaps of divergence between reward models. This was previously performed in notebooks/comparison.ipynb (now deleted) in a semi-manual process.
• Refactors visualization and data analysis code into a new package, evaluating_rewards.analysis, with a clearer separation between analysis in evaluating_rewards.analysis.results and visualization in evaluating_rewards.analysis.visualize.
• Matches style of paper closely.
• Color emoji support via LaTeX rendering!

[codecov[bot]]

Codecov Report

Merging #8 into master will increase coverage by 10.18%. The diff coverage is 76.28%.

@@             Coverage Diff             @@
##           master       #8       +/-   ##
===========================================
+ Coverage   71.32%   81.51%   +10.18%     
===========================================
  Files          39       41        +2     
  Lines        2382     2461       +79     
===========================================
+ Hits         1699     2006      +307     
+ Misses        683      455      -228

Impacted Files	Coverage Δ
tests/test_comparisons.py	100% <ø> (ø)	:arrow_up:
src/evaluating_rewards/envs/point_mass.py	83.23% <ø> (ø)	:arrow_up:
tests/test_scripts.py	100% <100%> (ø)	:arrow_up:
src/evaluating_rewards/serialize.py	73.01% <100%> (+2.32%)	:arrow_up:
src/evaluating_rewards/scripts/model_comparison.py	73.17% <100%> (ø)	:arrow_up:
src/evaluating_rewards/analysis/stylesheets.py	100% <100%> (ø)
src/evaluating_rewards/scripts/script_utils.py	53.33% <66.66%> (-2.92%)	:arrow_down:
src/evaluating_rewards/analysis/results.py	69.23% <69.23%> (ø)
...uating_rewards/analysis/plot_divergence_heatmap.py	70% <70%> (ø)
src/evaluating_rewards/analysis/visualize.py	83.15% <83.15%> (ø)
... and 5 more

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