refactor: Session library

[neznaika0]

Description

• Deprecations in Session have been removed.
• Unnecessary phpdocs have been cleared, dots have been added.
• Notes in changelog.
• Updated documentation, added examples.
• Fixed some phpstan errors

1. Since I haven't used any handlers other than FileHandler, what should I add to the guide about cleaning up old sessions? While I was reviewing the commit, I remembered about GC. Can I add information about him?
2. Where do these properties come from?

------ -------------------------------------------------------------------------------------- 
  Line   system/Session/Handlers/RedisHandler.php                                             
 ------ -------------------------------------------------------------------------------------- 
  :99    Access to an undefined property Config\Session::$lockWait.                           
         🪪  property.notFound                                                                
         💡  Learn more: https://phpstan.org/blog/solving-phpstan-access-to-undefined-property                                                                                    
  :100   Access to an undefined property Config\Session::$lockAttempts.                       
         🪪  property.notFound                                                                
         💡  Learn more: https://phpstan.org/blog/solving-phpstan-access-to-undefined-property  

3. With each update, the documentation gets confusing. We add various notes and it spoils the overall readability.
   I have removed the stop() method - it is not needed for the v4.7 documentation, but people reading for v4.3 should know about it. For good measure, we need to switch to a different version system for the guide. At least clear the notes for major versions 4.4, 4.5, 4.6...

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value (without duplication)
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[michalsn]

1. If you're referring to manually removing old session data, then yes. If you're referring to the PHP session GC mechanism, then no.

2. That is clearly a mistake. It should use the same property names as the fallback, but loaded from the config file.

3. I don't think we will make that change now. Maybe in the new docs, if we eventually migrate. Users on older CI versions can always download the appropriate version of the user guide from the userguide repository.

[github-actions]

👋 Hi, @neznaika0!

We detected conflicts in your PR against the base branch 🙊
You may want to sync 🔄 your branch with upstream!

Ref: Syncing Your Branch

[michalsn]

Looks good, thank you!