add pooled classification to timeseries plot

[codecov[bot]]

Codecov Report

Merging #265 into master will decrease coverage by 14.54%. The diff coverage is 25.00%.

@@             Coverage Diff             @@
##           master     #265       +/-   ##
===========================================
- Coverage   68.41%   53.86%   -14.55%     
===========================================
  Files          12       12               
  Lines        1013     1021        +8     
===========================================
- Hits          693      550      -143     
- Misses        320      471      +151     

Impacted Files	Coverage Δ
geosnap/_community.py	37.76% <25.00%> (-2.80%)	:arrow_down:
geosnap/analyze/dynamics.py	22.58% <0.00%> (-77.42%)	:arrow_down:
geosnap/io/storage.py	24.66% <0.00%> (-70.67%)	:arrow_down:
geosnap/io/util.py	48.83% <0.00%> (-30.24%)	:arrow_down:
geosnap/_data.py	74.11% <0.00%> (+3.52%)	:arrow_up:

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[knaaptime]

another nice enhancement would be to include a legendgram at the bottom of each plot so you could see how the binning breaks down over each annual distribution