feat(auth): improve auth events

[sebtiz13]

What does this PR do ?

Add before and after events for login and logout events to replace loginAttempt and logoutAttempt (previous events are keep for legacy).

So add the follow events:

• beforeLogin triggered before login attempt
• afterLogin triggered after login attempt and work exactly same as loginAttempt (same callback arguments)
• beforeLogout triggered before logout attempt
• afterLogout triggered after logout attempt and work exactly same as logoutAttempt (same callback arguments)

Other changes

• Refactor logout method to handle error and trigger afterLogout and logoutAttempt in error case

Boyscout

• Add logout events documentation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.01%. Comparing base (cb22867) to head (497d5c7).
Report is 16 commits behind head on 7-dev.

Additional details and impacted files

@@            Coverage Diff             @@
##            7-dev     #746      +/-   ##
==========================================
+ Coverage   82.86%   86.01%   +3.14%     
==========================================
  Files          46       46              
  Lines        2119     2131      +12     
  Branches      410      410              
==========================================
+ Hits         1756     1833      +77     
  Misses        282      282              
+ Partials       81       16      -65     

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[kuzzle]

🎉 This PR is included in version 7.12.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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