Add `scripts.distances.npec` to perform NPEC comparisons in parallel using Ray

[AdamGleave]

• Adds new NPEC script, scripts.distances.npec, matching the interface of scripts.distances.{epic,erc}.
• Adds plotting of NPEC-specific statistics to plot_heatmap.
• Removes some dead code from results.py and unneeded test data

[codecov[bot]]

Codecov Report

Merging #44 into master will decrease coverage by 0.15%. The diff coverage is 73.74%.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
- Coverage   85.25%   85.10%   -0.16%     
==========================================
  Files          65       65              
  Lines        4231     4262      +31     
==========================================
+ Hits         3607     3627      +20     
- Misses        624      635      +11     

Impacted Files	Coverage Δ
.../evaluating_rewards/analysis/distances/heatmaps.py	97.01% <ø> (+6.60%)	:arrow_up:
src/evaluating_rewards/distances/common_config.py	94.73% <ø> (+14.03%)	:arrow_up:
...wards/analysis/distances/plot_gridworld_heatmap.py	85.95% <14.28%> (-3.62%)	:arrow_down:
...luating_rewards/analysis/distances/plot_heatmap.py	66.46% <47.82%> (-10.23%)	:arrow_down:
src/evaluating_rewards/analysis/results.py	33.02% <66.66%> (+6.40%)	:arrow_up:
src/evaluating_rewards/scripts/distances/npec.py	79.68% <79.68%> (ø)
src/evaluating_rewards/scripts/distances/common.py	91.85% <83.58%> (-8.15%)	:arrow_down:
src/evaluating_rewards/scripts/distances/epic.py	91.59% <100.00%> (-0.26%)	:arrow_down:
src/evaluating_rewards/scripts/distances/erc.py	89.47% <100.00%> (ø)
tests/test_scripts.py	100.00% <100.00%> (ø)
... and 3 more

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