Add post_logout_redirect_uris field to application views

[tonial]

Description of the Change

These are missing since RP-initiated logout was added.

I added more tests on the applications views

• check that no posted data is dropped by the form on update and registration views,
• tests the displayed forms on the detail view.

Checklist

• PR only contains one change (considered splitting up PR)
• unit-test added
• documentation updated
• CHANGELOG.md updated (only for user relevant changes)
• author name in AUTHORS

[codecov]

Codecov Report

Merging #1285 (184c44c) into master (f28ca84) will increase coverage by 0.04%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #1285 +/- ## ========================================== + Coverage 97.25% 97.30% +0.04%  ========================================== Files 32 32 Lines 2005 2005 ========================================== + Hits 1950 1951 +1 + Misses 55 54 -1 

Impacted Files	Coverage Δ
oauth2_provider/views/application.py	100.00% <ø> (+3.22%)	⬆️

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[n2ygk]

This looks like new functionality that needs to be documented. Please update the docs. See docs related to redirect_uris

Looks like you may want to also update the create_application management command.

[tonial]

The management command already allows to specify post_logout_redirect_uris : see here

I've added the new fields in the documentation