Fix Manager::userHasPermission(), various fixes and improvements

[arogachev]

Q	A
Is bugfix?	✔️/❌
New feature?	✔️/❌
Breaks BC?	✔️/❌

Additionally:

• Improved Psalm types.
• Raised code coverage to 100%.
• Raised min MSI and fixed mutants.

[what-the-diff]

PR Summary

• Enhancement in Interface Management
  In the ManagerInterface, some new methods have been added such as getRole(), getPermission(), and hasChildren(). Additionally, there's a slight adjustment in parameter naming in the removePermission() method for clarity purposes.
• Improvement in Assignment Storage Interface
  Added a new method called filterUserItemNames() to AssignmentsStorageInterface, which will enable more tailored user item name filtering.
• Better Permission Management in Manager Class
  In the Manager class's userHasPermission() method, updates are made to tackle instances when either $userId is null or the guest role does not exist. This supports better handling of edge cases.
• Expansion of Manager Class
  New methods: getItemsByUserId() and getRole() are now part of the Manager class, enhancing its functionalities.
• Enhanced Testing Support
  Introduced support for rules in ManagerConfigurationTestTrait, improving our testing capabilities.
• New Class Addition in Support Test Directory
  A new class called SubscriptionRule has been added under the tests/Support directory, broadening the scope of the test support provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8b1ef5d) 100.00% compared to head (67bd795) 100.00%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##              master      #203   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity        98       123   +25     
===========================================
  Files             10        11    +1     
  Lines            288       330   +42     
===========================================
+ Hits             288       330   +42     

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