Logout hook plugin

[iaroslav-ciupin]

TL;DR

This hook allows to execute code before running actual logout handler

Type

• Bug Fix
• Feature
• Plugin

Are all requirements met?

• Code completed
• Smoke tested
• Unit tests added
• Code documentation added
• Any pending items have an associated Issue

Complete description

How did you fix the bug, make the feature etc. Link to any design docs etc

Tracking Issue

Remove the 'fixes' keyword if there will be multiple PRs to fix the linked issue

fixes https://github.com/flyteorg/flyte/issues/

Follow-up issue

NA
OR
https://github.com/flyteorg/flyte/issues/

[codecov]

Codecov Report

Patch coverage: 84.61% and project coverage change: +1.56% 🎉

Comparison is base (b32a3d3) 58.93% compared to head (7290799) 60.50%.

❗ Current head 7290799 differs from pull request most recent head a254eda. Consider uploading reports for the commit a254eda to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #611      +/-   ##
==========================================
+ Coverage   58.93%   60.50%   +1.56%     
==========================================
  Files         171      171              
  Lines       16460    13442    -3018     
==========================================
- Hits         9701     8133    -1568     
+ Misses       5909     4458    -1451     
- Partials      850      851       +1     

Flag	Coverage Δ
unittests	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
plugins/registry.go	100.00% <ø> (ø)
auth/handlers.go	40.15% <83.33%> (+3.81%)	⬆️
auth/cookie.go	81.60% <100.00%> (+2.76%)	⬆️

... and 155 files with indirect coverage changes

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