Buffered, on-demand reading of time series

[ckittl]

Closes #420

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.86%. Comparing base (f922492) to head (a355423).
⚠️ Report is 3473 commits behind head on dev.

Additional details and impacted files

@@             Coverage Diff              @@
##                dev     #421      +/-   ##
============================================
- Coverage     78.92%   78.86%   -0.07%     
- Complexity     2106     2138      +32     
============================================
  Files           259      261       +2     
  Lines          8253     8357     +104     
  Branches        775      783       +8     
============================================
+ Hits           6514     6591      +77     
- Misses         1346     1363      +17     
- Partials        393      403      +10     

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