Performance improvement: use chained StringBuilder calls instead of s…

[majst01]

…ingle calls, closes #425

[codecov-io]

Codecov Report

Merging #426 into master will increase coverage by 0.16%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master     #426      +/-   ##
============================================
+ Coverage     84.86%   85.03%   +0.16%     
  Complexity      270      270              
============================================
  Files            19       19              
  Lines          1183     1183              
  Branches        119      119              
============================================
+ Hits           1004     1006       +2     
+ Misses          118      116       -2     
  Partials         61       61

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/org/influxdb/dto/BatchPoints.java	69.04% <0%> (ø)	20 <0> (ø)	⬇️
src/main/java/org/influxdb/impl/InfluxDBImpl.java	85.66% <0%> (+0.65%)	61% <0%> (ø)	⬇️

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