implemented configurable Bigtable write batch size.

[sming]

Make BulkMutation Batch Size Configurable (v0.5.1)

• I am a prism dev
• Who wants to stabilize heroic
• So that I can focus on new functionality

Design & Implementation Notes

• See this section in the Stability RFC for details

[lmuhlha]

Looks reasonable to me 👍 might be good to get another pair of eyes on it but +1

[codecov[bot]]

Codecov Report

Merging #706 into master will increase coverage by 0.19%. The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #706      +/-   ##
============================================
+ Coverage     54.21%   54.40%   +0.19%     
- Complexity     3040     3052      +12     
============================================
  Files           735      735              
  Lines         19808    19866      +58     
  Branches       1304     1304              
============================================
+ Hits          10738    10808      +70     
+ Misses         8603     8591      -12     
  Partials        467      467              

Impacted Files	Coverage Δ	Complexity Δ
...com/spotify/heroic/metric/MetricManagerModule.java	74.10% <100.00%> (+3.69%)	18.00 <2.00> (+2.00)
...ytics/bigtable/BigtableAnalyticsMetricBackend.java	27.27% <100.00%> (+3.46%)	3.00 <1.00> (+1.00)
...potify/heroic/metric/bigtable/BigtableBackend.java	88.92% <100.00%> (+0.08%)	61.00 <1.00> (+1.00)
...oic/metric/bigtable/BigtableConnectionBuilder.java	94.44% <100.00%> (+4.70%)	5.00 <2.00> (+2.00)
...y/heroic/metric/bigtable/BigtableMetricModule.java	85.85% <100.00%> (+7.77%)	7.00 <3.00> (+2.00)
.../com/spotify/heroic/common/EmptyOptionalLimit.java	70.58% <0.00%> (+8.82%)	19.00% <0.00%> (+2.00%)
.../com/spotify/heroic/common/ValueOptionalLimit.java	55.55% <0.00%> (+9.25%)	20.00% <0.00%> (+1.00%)
...igtable/credentials/DefaultCredentialsBuilder.java	100.00% <0.00%> (+33.33%)	3.00% <0.00%> (+1.00%)

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