Custom code coverage driver support

[sebastianbergmann]

This proposes the ability to specify a custom code coverage driver class in the XML configuration file, instead of relying on php-code-coverage's automatic driver selection.

A driver attribute is to the <coverage> element:

<coverage driver="My\Custom\Driver">
    <!-- ... -->
</coverage>

The specified class must

• exist and be autoloadable,
• extend SebastianBergmann\CodeCoverage\Driver\Driver, and
• be instantiable (not abstract)

If the driver's constructor requires parameters, PHPUnit will pass the coverage Filter as the first argument. If it takes no required parameters, it is instantiated with no arguments. Path coverage is automatically enabled on the driver if configured.

[codecov]

Codecov Report

❌ Patch coverage is 78.26087% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.57%. Comparing base (11c89af) to head (5f49d37).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/TextUI/Configuration/Configuration.php	66.66%	2 Missing ⚠️
...UI/Configuration/Xml/CodeCoverage/CodeCoverage.php	77.77%	2 Missing ⚠️
src/TextUI/Configuration/Merger.php	75.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6586      +/-   ##
============================================
- Coverage     96.59%   96.57%   -0.02%     
- Complexity     8026     8032       +6     
============================================
  Files           839      839              
  Lines         24830    24851      +21     
============================================
+ Hits          23984    24000      +16     
- Misses          846      851       +5     

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