Add options to backup roles and users

[dirkkul]

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.

Please upload report for BASE (dev/1.30@0a1e76c). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
weaviate/backup/backup.py	80.00%	2 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##             dev/1.30    #1607   +/-   ##
===========================================
  Coverage            ?   88.40%           
===========================================
  Files               ?      190           
  Lines               ?    16699           
  Branches            ?        0           
===========================================
  Hits                ?    14762           
  Misses              ?     1937           
  Partials            ?        0           

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