Add Review Stages Setting

[tomatoprinx]

Types of changes

• [ ] Bugfix
• [x] New feature
• [ ] Refactoring
• [ ] Breaking change (any change that would cause existing functionality to not work as expected)
• [ ] Documentation Update
• [ ] Other (please describe)

Description

• Initialize setting review / proposal stage page
• Created new branch from current master branch and cherrypicked from #782

Steps to Test This Pull Request

Steps to reproduce the behavior:

1. Login with admin account
2. Go to 'Review Stages' page
3. Click hotkeys in the 'Set Review Stage' section
4. Submit

Expected behavior

• [ ] Only admin can see this page.
• [x] Review stages hotkeys corresponding to Proposal Review System Documentation.
• [x] Submit and update the setting to dj-registry.
• [x] Rendering current stage settings to the frontend.

Related Issue

782

More Information

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 26.41509% with 39 lines in your changes missing coverage. Please review.

Project coverage is 73.17%. Comparing base (2a232a0) to head (8b9d274). Report is 12 commits behind head on master.

Files	Patch %	Lines
src/reviews/views.py	20.83%	38 Missing :warning:
src/proposals/templatetags/proposals.py	75.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1204 +/- ## ========================================== - Coverage 74.01% 73.17% -0.85% ========================================== Files 81 81 Lines 3060 3113 +53 ========================================== + Hits 2265 2278 +13 - Misses 795 835 +40 ```

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