Added synchronous blocking API to Write time-series data into InfluxDB 2.0

[bednar]

Closes #41 #7

Added synchronous blocking API to Write time-series data into InfluxDB 2.0

• CHANGELOG.md updated
• Rebased/mergeable
• Tests pass
• Sign CLA (if not already signed)

[codecov-io]

Codecov Report

Merging #42 into master will increase coverage by 0.11%.
The diff coverage is 98.83%.

@@             Coverage Diff             @@
##             master     #42      +/-   ##
===========================================
+ Coverage     91.98%   92.1%   +0.11%     
  Complexity      606     606              
===========================================
  Files           129     130       +1     
  Lines          4594    4672      +78     
  Branches        183     183              
===========================================
+ Hits           4226    4303      +77     
  Misses          297     297              
- Partials         71      72       +1

Impacted Files	Coverage Δ	Complexity Δ
...nfluxdata/client/internal/AbstractWriteClient.java	91.12% <100%> (+0.1%)	0 <0> (ø)	⬇️
...influxdata/client/internal/InfluxDBClientImpl.java	100% <100%> (ø)	0 <0> (ø)	⬇️
...a/org/influxdata/client/internal/WriteApiImpl.java	100% <100%> (ø)	0 <0> (ø)	⬇️
...client/reactive/internal/WriteReactiveApiImpl.java	100% <100%> (ø)	0 <0> (ø)	⬇️
...fluxdata/client/internal/WriteApiBlockingImpl.java	98.63% <98.63%> (ø)	0 <0> (?)

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