Separating code gen / package gen for Java

[garrettjonesgoogle]

No description provided.

[codecov-io]

Codecov Report

Merging #2166 into master will decrease coverage by 0.03%.
The diff coverage is 81.08%.

@@             Coverage Diff              @@
##             master    #2166      +/-   ##
============================================
- Coverage     86.83%   86.79%   -0.04%     
- Complexity     5117     5118       +1     
============================================
  Files           454      454              
  Lines         20293    20286       -7     
  Branches       2173     2178       +5     
============================================
- Hits          17622    17608      -14     
- Misses         1905     1907       +2     
- Partials        766      771       +5

Impacted Files	Coverage Δ	Complexity Δ
.../api/codegen/packagegen/PackagingArtifactType.java	66.66% <33.33%> (-17.95%)	2 <0> (ø)
...oogle/api/codegen/gapic/GapicGeneratorFactory.java	89.61% <90.32%> (-1.42%)	11 <1> (+1)

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[andreamlin]

LGTM