Support generic POJO super classes

[eranl]

Also, simplify type checking.

Should I add this to the manual?

[codecov-commenter]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (e93949f) 60.98% compared to head (66f3075) 61.05%.
Report is 1 commits behind head on master.

❗ Current head 66f3075 differs from pull request most recent head 2394d26. Consider uploading reports for the commit 2394d26 to get more accurate results

Files	Patch %	Lines
...n/java/org/influxdb/impl/InfluxDBResultMapper.java	90.74%	3 Missing and 2 partials ⚠️
src/main/java/org/influxdb/impl/TypeMapper.java	75.00%	2 Missing and 2 partials ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #980      +/-   ##
============================================
+ Coverage     60.98%   61.05%   +0.07%     
- Complexity      435      437       +2     
============================================
  Files            70       71       +1     
  Lines          2568     2583      +15     
  Branches        276      278       +2     
============================================
+ Hits           1566     1577      +11     
- Misses          932      933       +1     
- Partials         70       73       +3     

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[majst01]

Support for Generics is for sure worth mentioning in the manual.

[eranl]

Support for Generics is for sure worth mentioning in the manual.

Done