CLI for permissions batch update

[fmigneault]

• define a CLI operation for batch permission update (fixes [Feature] Provide a CLI utility to directly load a set of permissions and submit it to a remote instance #611)
• add tests for fix permissions update from config using requests code path #610

[codecov]

Codecov Report

Attention: Patch coverage is 83.05085% with 10 lines in your changes missing coverage. Please review.

Project coverage is 81.18%. Comparing base (5ee83c5) to head (95eef9d).

❗ Current head 95eef9d differs from pull request most recent head 86ac29e

Please upload reports for the commit 86ac29e to get more accurate results.

Files	Patch %	Lines
magpie/register.py	77.41%	6 Missing and 1 partial ⚠️
magpie/cli/batch_update_permissions.py	89.28%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@                      Coverage Diff                       @@
##           fix-register-perms-request     #612      +/-   ##
==============================================================
+ Coverage                       80.88%   81.18%   +0.29%     
==============================================================
  Files                              73       74       +1     
  Lines                           10191    10240      +49     
  Branches                         1825     1835      +10     
==============================================================
+ Hits                             8243     8313      +70     
+ Misses                           1625     1604      -21     
  Partials                          323      323              

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