Add batchSize to saveAll / destroyAll

[dplewis]

No description provided.

[codecov]

Codecov Report

Merging #422 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #422      +/-   ##
==========================================
- Coverage   98.98%   98.98%   -0.01%     
==========================================
  Files          38       38              
  Lines        3147     3146       -1     
==========================================
- Hits         3115     3114       -1     
  Misses         32       32

Impacted Files	Coverage Δ
src/Parse/ParseObject.php	97.85% <100%> (-0.01%)	⬇️

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