Feature/arrow aggrigator

[Ignalina]

Would be good to have this in main so we dont diverge to much.

improved:
made CLAP use 3 subcomands mock,slice,parse
Partial impl of parse.

bad news:
No unit test

[codecov-commenter]

Codecov Report

Attention: 114 lines in your changes are missing coverage. Please review.

Comparison is base (3ed5a73) 33.28% compared to head (8070db7) 31.55%.

Files	Patch %	Lines
src/builder_datatypes.rs	0.00%	48 Missing ⚠️
src/main.rs	0.00%	45 Missing ⚠️
src/builder.rs	0.00%	16 Missing ⚠️
src/mock.rs	0.00%	4 Missing ⚠️
src/slicer.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #17      +/-   ##
==========================================
- Coverage   33.28%   31.55%   -1.73%     
==========================================
  Files           5        7       +2     
  Lines         712      751      +39     
==========================================
  Hits          237      237              
- Misses        475      514      +39     

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