Adding BatchingSettings getter to BatchingCallSettings.Builder

[rahulKQL]

No description provided.

[codecov]

Codecov Report

Merging #779 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #779      +/-   ##
============================================
+ Coverage     78.38%   78.39%   +<.01%     
  Complexity     1106     1106              
============================================
  Files           198      198              
  Lines          4886     4887       +1     
  Branches        385      385              
============================================
+ Hits           3830     3831       +1     
  Misses          887      887              
  Partials        169      169

Impacted Files	Coverage Δ	Complexity Δ
.../google/api/gax/batching/BatchingCallSettings.java	96.29% <100%> (+0.14%)	5 <0> (ø)	⬇️

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[igorbernstein2]

LGTM