Add quality diagnostics A001 and A002

[khaeru]

Closes #15 by completing the initial set of identified diagnostic calculations.

• Fix incorrect units in T008 (in the Jupyter notebook in #22, thus copied to #71): vehicles, not 10⁶ vehicles.

[codecov[bot]]

Codecov Report

Merging #74 (0255b04) into main (417eeb5) will increase coverage by 0.18%. The diff coverage is 84.61%.

@@            Coverage Diff             @@
##             main      #74      +/-   ##
==========================================
+ Coverage   72.93%   73.12%   +0.18%     
==========================================
  Files          32       34       +2     
  Lines        1371     1388      +17     
==========================================
+ Hits         1000     1015      +15     
- Misses        371      373       +2     

Impacted Files	Coverage Δ
item/historical/diagnostic/__init__.py	46.93% <33.33%> (-2.00%)	:arrow_down:
item/historical/T008.py	100.00% <100.00%> (ø)
item/historical/diagnostic/A001.py	100.00% <100.00%> (ø)
item/historical/diagnostic/A002.py	100.00% <100.00%> (ø)
item/historical/diagnostic/A003.py	100.00% <100.00%> (ø)

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[khaeru]

Here's an example run showing the output of the added A001 and A002 diagnostics: https://storage.googleapis.com/data.transportenergy.org/historical/ci/8/index.html