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 95.85%. Comparing base (675f9d8) to head (d3b8bad).
✅ 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    #6544      +/-   ##
============================================
- Coverage     95.87%   95.85%   -0.02%     
- Complexity     7561     7567       +6     
============================================
  Files           817      817              
  Lines         23407    23428      +21     
============================================
+ Hits          22442    22458      +16     
- Misses          965      970       +5     

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