feat(belongs-to-many): get/has/count for paranoid join table

[sushantdhiman]

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Description of change

Fixes #6790

[codecov]

Codecov Report

Merging #12256 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #12256   +/-   ##
=======================================
  Coverage   96.33%   96.33%           
=======================================
  Files          95       95           
  Lines        9120     9120           
=======================================
  Hits         8786     8786           
  Misses        334      334           

Impacted Files	Coverage Δ
lib/associations/belongs-to-many.js	98.02% <ø> (ø)

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