Support NaN skipping for the range calculations.

[LTLA]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 97.67442% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 95.05%. Comparing base (4f9b9f3) to head (a921aa8).

Files	Patch %	Lines
include/tatami_stats/ranges.hpp	96.47%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master       #2   +/-   ##
=======================================
  Coverage   95.04%   95.05%           
=======================================
  Files          17       17           
  Lines        1352     1395   +43     
  Branches       12       10    -2     
=======================================
+ Hits         1285     1326   +41     
- Misses         62       64    +2     
  Partials        5        5           

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