Move methods from command to abstract pdo command

[Tigrov]

Related with yiisoft/db#770

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues	-

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (11f981b) 98.46% compared to head (4e85b0e) 98.42%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #278      +/-   ##
============================================
- Coverage     98.46%   98.42%   -0.04%     
+ Complexity      342      332      -10     
============================================
  Files            19       19              
  Lines          1039     1018      -21     
============================================
- Hits           1023     1002      -21     
  Misses           16       16              

Files	Coverage Δ
src/Command.php	98.59% <ø> (-0.33%)	⬇️

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[what-the-diff]

PR Summary

• Removal of unused import statements
  Certain import statements in the Command.php file were removed. These were originally meant for classes like PDOException, ConvertException, and QueryBuilderInterface which are not used in this file, making them unnecessary.

• Deletion of getQueryBuilder() method
  The getQueryBuilder() method in the Command.php file was removed. This method was no longer in use and thus its presence in the codebase was not necessary.

• Deletion of internalExecute() method
  Similarly, internalExecute() method in Command.php was also removed from this file as it had no current uses in the application.

These changes aim to make the codebase more maintainable, clean, and organized. The removal of unused declarations improves code readability and reduces the chance of complexity or confusion in the future.