Bundling restructure

[michaelbausor]

Replaces #214

[codecov-io]

Codecov Report

Merging #226 into bundling-flowcontrol-branch will decrease coverage by -0.21%.
The diff coverage is 83.83%.

@@                       Coverage Diff                       @@
##             bundling-flowcontrol-branch   #226      +/-   ##
===============================================================
- Coverage                           70.2%    70%   -0.21%     
- Complexity                           483    485       +2     
===============================================================
  Files                                 67     68       +1     
  Lines                               2541   2557      +16     
  Branches                             267    267              
===============================================================
+ Hits                                1784   1790       +6     
- Misses                               659    669      +10     
  Partials                              98     98

Impacted Files	Coverage Δ	Complexity Δ
...e/api/gax/bundling/AccumulatingBundleReceiver.java	83.33% <100%> (ø)	3 <1> (ø)	❌
.../com/google/api/gax/bundling/ThresholdBundler.java	96.55% <100%> (-0.03%)	27 <0> (-1)
...java/com/google/api/gax/grpc/BundlingCallable.java	88.88% <100%> (ø)	3 <0> (ø)	❌
...n/java/com/google/api/gax/grpc/BundleExecutor.java	100% <100%> (ø)	5 <2> (-1)	❌
src/main/java/com/google/api/gax/grpc/Bundle.java	55% <55%> (ø)	4 <4> (?)
...n/java/com/google/api/gax/grpc/BundlerFactory.java	78.46% <73.68%> (-1.87%)	12 <9> (+1)
.../com/google/api/gax/grpc/BundledRequestIssuer.java	78.94% <75%> (ø)	6 <2> (?)
...e/api/gax/bundling/ThresholdBundlingForwarder.java	87.5% <83.33%> (ø)	4 <1> (ø)	❌

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[garrettjonesgoogle]

LGTM after doc stuff is addressed.