Features/add fields by pojo

[mirza99]

Enable adding fields by passing a POJO to the Builder.

How to use it

// Order is a POJO having annotations @Measurement and @Column
Order order = new Order();
// ... setting data

Point p = Point.measurementByPOJO(order.getClass()).addFieldsFromPOJO(order).build();

[codecov-io]

Codecov Report

Merging #519 into master will increase coverage by 0.03%.
The diff coverage is 90.9%.

@@             Coverage Diff              @@
##             master     #519      +/-   ##
============================================
+ Coverage     88.05%   88.09%   +0.03%     
- Complexity      697      703       +6     
============================================
  Files            68       69       +1     
  Lines          2378     2411      +33     
  Branches        240      245       +5     
============================================
+ Hits           2094     2124      +30     
- Misses          198      201       +3     
  Partials         86       86

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/org/influxdb/BuilderException.java	100% <100%> (ø)	1 <1> (?)
src/main/java/org/influxdb/dto/Point.java	85.34% <90.32%> (+0.96%)	40 <5> (+5)	⬆️

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[fmachado]

@mirza99 I would like to merge this PR but some checks are failing. Would be possible to fix them? Thanks again for your contribution!

[mirza99]

@fmachado You can merge the PR now. Sorry for the delay.