CakePHP 5 upgrade

[LordSimal]

Basically the same as #75 just with the new branch

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 85.50725% with 20 lines in your changes missing coverage. Please review.

Project coverage is 90.51%. Comparing base (716617e) to head (c1acf25).
Report is 26 commits behind head on 8.next-cake5.

Files with missing lines	Patch %	Lines
src/Test/BaseTestTrait.php	0.00%	5 Missing ⚠️
src/Traits/ReCaptchaTrait.php	20.00%	4 Missing ⚠️
src/Social/Service/OAuth1Service.php	40.00%	3 Missing ⚠️
src/Social/Service/OAuth2Service.php	50.00%	3 Missing ⚠️
src/Authentication/AuthenticationService.php	91.66%	1 Missing ⚠️
src/Rbac/Permissions/AbstractProvider.php	80.00%	1 Missing ⚠️
src/Rbac/Rules/RuleRegistry.php	50.00%	1 Missing ⚠️
src/Social/Mapper/Amazon.php	0.00%	1 Missing ⚠️
src/Social/Mapper/Tumblr.php	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@                Coverage Diff                 @@
##             8.next-cake5      #76      +/-   ##
==================================================
+ Coverage           90.39%   90.51%   +0.12%     
- Complexity            317      319       +2     
==================================================
  Files                  46       46              
  Lines                 781      886     +105     
==================================================
+ Hits                  706      802      +96     
- Misses                 75       84       +9     

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