chore: api generator was moved to separate influxdb-clients-apigen module

[rhajek]

Closes #141

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• mvn test completes successfully
• Commit messages are in semantic format
• Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

Merging #142 into master will decrease coverage by 0.00%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #142      +/-   ##
============================================
- Coverage     90.85%   90.85%   -0.01%     
  Complexity      441      441              
============================================
  Files           137      137              
  Lines          5391     5389       -2     
  Branches        207      202       -5     
============================================
- Hits           4898     4896       -2     
  Misses          414      414              
  Partials         79       79              

Impacted Files	Coverage Δ	Complexity Δ
...ava/com/influxdb/query/internal/FluxCsvParser.java	96.92% <0.00%> (-0.03%)	0.00% <0.00%> (ø%)
...ava/com/influxdb/client/InfluxDBClientFactory.java	100.00% <0.00%> (ø)	0.00% <0.00%> (ø%)

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