Improve distance heatmap plotting and calculation

[AdamGleave]

• Some minor stylistic changes: e.g. font size, margins; to fit into NeurIPS style.
• Rename scripts to be consistent with naming convention in paper.
• Add vals_path parameter to CLI config which, if specified, will avoid computing new results and instead load the results from the pickle.
• Reduce memory consumption of plot_erc_heatmap.py (formerly plot_return_heatmap.py) by batching return computation.
• Fix bug in confidence interval computation in plot_npec_heatmap.py (formerly plot_epic_heatmap.py): normalize before confidence interval computation rather than after (previously lower bound was e.g. lower/lower rather than lower/upper)

[codecov[bot]]

Codecov Report

Merging #34 into master will increase coverage by 0.21%. The diff coverage is 88.63%.

@@            Coverage Diff             @@
##           master      #34      +/-   ##
==========================================
+ Coverage   87.41%   87.62%   +0.21%     
==========================================
  Files          57       57              
  Lines        4004     4040      +36     
==========================================
+ Hits         3500     3540      +40     
+ Misses        504      500       -4     

Impacted Files	Coverage Δ
src/evaluating_rewards/analysis/stylesheets.py	71.42% <ø> (ø)
src/evaluating_rewards/epic_sample.py	97.84% <ø> (ø)
src/evaluating_rewards/rewards.py	96.34% <ø> (+0.24%)	:arrow_up:
src/evaluating_rewards/scripts/npec_comparison.py	79.45% <ø> (ø)
...ewards/analysis/dissimilarity_heatmaps/heatmaps.py	91.86% <50.00%> (+9.10%)	:arrow_up:
...s/dissimilarity_heatmaps/plot_gridworld_heatmap.py	91.07% <71.42%> (-0.68%)	:arrow_down:
...ards/analysis/dissimilarity_heatmaps/cli_common.py	77.66% <78.94%> (+0.19%)	:arrow_up:
...nalysis/dissimilarity_heatmaps/plot_erc_heatmap.py	89.36% <87.50%> (ø)
...alysis/dissimilarity_heatmaps/plot_npec_heatmap.py	89.10% <89.10%> (ø)
...alysis/dissimilarity_heatmaps/plot_epic_heatmap.py	91.13% <92.36%> (+1.44%)	:arrow_up:
... and 8 more

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