refactor: Model

[kenjis]

Description

• fix and add PHPDoc types
• extract methods
• rename parameter names

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[michalsn]

I'm not sure about changes that restrict the use of certain methods to the Entity class only.

[kenjis]

The PHPStan errors are not related to this PR.
And I cannot reproduce them in my local environment.

 ------ ----------------------------------------------------------------------- 
  Line   system/Log/Logger.php                                                  
 ------ ----------------------------------------------------------------------- 
         Ignored error pattern #^Parameter \#1 \$level \(string\) of method     
         CodeIgniter\\Log\\Logger\:\:log\(\) should be contravariant with       
         parameter \$level \(mixed\) of method                                  
         Psr\\Log\\LoggerInterface\:\:log\(\)$# in path                         
         /home/runner/work/CodeIgniter4/CodeIgniter4/system/Log/Logger.php was  
         not matched in reported errors.                                        
  159    Parameter #1 $message (string) of method                               
         CodeIgniter\Log\Logger::emergency() should be contravariant with       
         parameter $message (mixed) of method                                   
         PsrExt\Log\LoggerInterface::emergency()                                
  172    Parameter #1 $message (string) of method                               
         CodeIgniter\Log\Logger::alert() should be contravariant with           
         parameter $message (mixed) of method                                   
         PsrExt\Log\LoggerInterface::alert()                                    
  184    Parameter #1 $message (string) of method                               
         CodeIgniter\Log\Logger::critical() should be contravariant with        
         parameter $message (mixed) of method                                   
         PsrExt\Log\LoggerInterface::critical()                                 
  195    Parameter #1 $message (string) of method                               
         CodeIgniter\Log\Logger::error() should be contravariant with           
         parameter $message (mixed) of method                                   
         PsrExt\Log\LoggerInterface::error()                                    
  208    Parameter #1 $message (string) of method                               
         CodeIgniter\Log\Logger::warning() should be contravariant with         
         parameter $message (mixed) of method                                   
         PsrExt\Log\LoggerInterface::warning()                                  
  218    Parameter #1 $message (string) of method                               
         CodeIgniter\Log\Logger::notice() should be contravariant with          
         parameter $message (mixed) of method                                   
         PsrExt\Log\LoggerInterface::notice()                                   
  230    Parameter #1 $message (string) of method                               
         CodeIgniter\Log\Logger::info() should be contravariant with parameter  
         $message (mixed) of method PsrExt\Log\LoggerInterface::info()          
  240    Parameter #1 $message (string) of method                               
         CodeIgniter\Log\Logger::debug() should be contravariant with           
         parameter $message (mixed) of method                                   
         PsrExt\Log\LoggerInterface::debug()                                    
  251    Parameter #1 $level (string) of method CodeIgniter\Log\Logger::log()   
         should be contravariant with parameter $level (mixed) of method        
         PsrExt\Log\LoggerInterface::log()                                      
  251    Parameter #2 $message (string) of method                               
         CodeIgniter\Log\Logger::log() should be contravariant with parameter   
         $message (mixed) of method PsrExt\Log\LoggerInterface::log()           
 ------ ----------------------------------------------------------------------- 

 ------ ------------------------------------------------------------------------ 
  Line   system/Test/TestLogger.php                                              
 ------ ------------------------------------------------------------------------ 
         Ignored error pattern #^Parameter \#1 \$level \(string\) of method      
         CodeIgniter\\Test\\TestLogger\:\:log\(\) should be contravariant with   
         parameter \$level \(mixed\) of method                                   
         Psr\\Log\\LoggerInterface\:\:log\(\)$# in path                          
         /home/runner/work/CodeIgniter4/CodeIgniter4/system/Test/TestLogger.php  
         was not matched in reported errors.                                     
  30     Parameter #1 $level (string) of method                                  
         CodeIgniter\Test\TestLogger::log() should be contravariant with         
         parameter $level (mixed) of method PsrExt\Log\LoggerInterface::log()    
  30     Parameter #2 $message (string) of method                                
         CodeIgniter\Test\TestLogger::log() should be contravariant with         
         parameter $message (mixed) of method                                    
         PsrExt\Log\LoggerInterface::log()                                       
 ------ ------------------------------------------------------------------------ 

https://github.com/codeigniter4/CodeIgniter4/actions/runs/7121907724/job/19392022128?pr=8260

Created an issue #8300