Drmorr/custom flush times

[drmorr0]

Add a --flush-interval flag to allow you to set custom flush times, instead of hard-coding to 1 hour

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 21 lines in your changes missing coverage. Please review.

Project coverage is 43.65%. Comparing base (3e4ad72) to head (c9933d5).
Report is 3 commits behind head on master.

Files	Patch %	Lines
pkg/parquet/writer.go	65.85%	11 Missing and 3 partials ⚠️
cmd/root.go	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #7      +/-   ##
==========================================
+ Coverage   40.18%   43.65%   +3.47%     
==========================================
  Files           7        7              
  Lines         331      339       +8     
==========================================
+ Hits          133      148      +15     
+ Misses        189      180       -9     
- Partials        9       11       +2     

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