feat: add stdout-handling

[christian-monch]

This PR fixes #82

By default it suppresses all output on stdout that is created when the commands in a template are executed. The output can be written to a file by specifying the -s/--stdout argument in datalad make.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 51.85185% with 13 lines in your changes missing coverage. Please review.

Project coverage is 90.93%. Comparing base (42537a0) to head (49a3539).

Files with missing lines	Patch %	Lines
datalad_remake/annexremotes/remake_remote.py	18.75%	12 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #89      +/-   ##
==========================================
+ Coverage   83.08%   90.93%   +7.84%     
==========================================
  Files          29       29              
  Lines        1141     1158      +17     
  Branches      102      105       +3     
==========================================
+ Hits          948     1053     +105     
+ Misses        152       75      -77     
+ Partials       41       30      -11     

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