Fix pagination in getAllCountsByColumn

[benvinegar]

Fixes #122

I realize now getAllCountsByColumn had flawed logic; it was trying to get the top N rows, but also trying to simultaneously get data for visitors and views which doesn't work because that needs 2x the rows, and the count properties might not return in the same order either.

So instead this makes two queries:

1. First, queries the column by visitor count. This first query determines the order (so the rows are sorted by visitor count, not view count).

2. Then, make another query by view count, using a WHERE $column IN ($columnVal1, $columnVal1, ... $columnVal1) clause from the results of the first query.

This is slower of course, but it seems unavoidable the way Analytics Engine works.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.08%. Comparing base (db24a2b) to head (47af390).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #123      +/-   ##
==========================================
+ Coverage   80.93%   81.08%   +0.14%     
==========================================
  Files          32       32              
  Lines        2271     2289      +18     
  Branches      250      253       +3     
==========================================
+ Hits         1838     1856      +18     
  Misses        425      425              
  Partials        8        8              

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