[pdosqlexec] Fixed PHP 8 compat, Code Cleanup and tests

[siad007]

• Added test and some return types.
• Added errorproperty
• Added statementcountproperty
• Updated grammar

Related to #1626

[codecov]

Codecov Report

Merging #1628 (8948b27) into main (bb891e1) will increase coverage by 0.80%.
The diff coverage is 68.42%.

@@             Coverage Diff              @@
##               main    #1628      +/-   ##
============================================
+ Coverage     56.87%   57.68%   +0.80%     
- Complexity     6927     6932       +5     
============================================
  Files           355      355              
  Lines         16778    16790      +12     
============================================
+ Hits           9543     9685     +142     
+ Misses         7235     7105     -130     

Impacted Files	Coverage Δ
src/Phing/Task/System/Pdo/PDOQuerySplitter.php	100.00% <ø> (ø)
.../Phing/Task/System/Pdo/PlainPDOResultFormatter.php	19.35% <0.00%> (+19.35%)	⬆️
src/Phing/Task/System/Pdo/PDOSQLExecTask.php	75.40% <64.58%> (+22.26%)	⬆️
...ing/Task/System/Pdo/PDOSQLExecFormatterElement.php	67.14% <70.58%> (+67.14%)	⬆️
src/Phing/Io/BufferedReader.php	81.63% <100.00%> (ø)
.../Phing/Task/System/Pdo/DefaultPDOQuerySplitter.php	97.82% <100.00%> (ø)
...rc/Phing/Task/System/Pdo/DummyPDOQuerySplitter.php	93.33% <100.00%> (+93.33%)	⬆️
...rc/Phing/Task/System/Pdo/PgsqlPDOQuerySplitter.php	86.55% <100.00%> (ø)
src/Phing/Task/System/Pdo/PDOTask.php	72.09% <0.00%> (+9.30%)	⬆️
... and 7 more

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