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 (dcb2370) 99.08% compared to head (cdd3762) 99.04%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #309      +/-   ##
============================================
- Coverage     99.08%   99.04%   -0.04%     
+ Complexity      184      174      -10     
============================================
  Files            13       13              
  Lines           545      524      -21     
============================================
- Hits            540      519      -21     
  Misses            5        5              

Files	Coverage Δ
src/Command.php	94.73% <ø> (-2.77%)	⬇️

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[what-the-diff]

PR Summary

• Modification in Command.php File
  The main file operating the command functionalities has undergone some amendments.

• Removal of Certain use Statements
  Four classes, namely PDOException, Throwable, ConvertException, and QueryBuilderInterface were removed. This indicates a possible cleanup or refactored usage of these classes within the code.

• Removal of getQueryBuilder() Method
  The function used to get the query builder has been erased. This suggests changes in the way queries are being made within the system.

• Changes in internalExecute() Method
  This method is responsible for executing queries and handling exceptions. There have been modifications in this logic which implies the system has changed the way it handles database query executions and the potential errors that may arise.

• No changes to showDatabases() Method
  This method used to display the databases remains unchanged, indicating no alterations in the way databases are being displayed.