CLI for permissions batch update

[fmigneault]

• define a CLI operation for batch permission update (fixes #611)
• add tests for #610

[codecov[bot]]

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).

:exclamation: 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 :warning:
magpie/cli/batch_update_permissions.py	89.28%	2 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ 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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