fix: copy Attributes on Splitting Result Sets

[ulbi]

Closes #144

Proposed Changes

Briefly describe your proposed changes:
Just copied the attributes from the incoming flowFile and also hand them over, if there are subsequent one created.

Checklist

• Rebased/mergeable
• Tests pass

[codecov-commenter]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (849b374) 34.23% compared to head (e2c462d) 34.15%.
Report is 3 commits behind head on master.

Files	Patch %	Lines
...ocessors/internal/AbstractGetInfluxDatabase_2.java	0.00%	7 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #147      +/-   ##
============================================
- Coverage     34.23%   34.15%   -0.09%     
  Complexity      131      131              
============================================
  Files            27       27              
  Lines          2024     2029       +5     
  Branches        145      146       +1     
============================================
  Hits            693      693              
- Misses         1303     1308       +5     
  Partials         28       28              

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[bednar]

Thank you for your PR!

LGTM 🚀