Enable named data sets with the #[TestWith*] attributes

[HypeMC]

Adds an optional data set name argument to the #[TestWith] & #[TestWithJson] attributes:

#[TestWith(['a', 'b'], 'Name1')]
#[TestWith(['c', 'd'], 'Name2')]
public function testFoo(string $one, string $two)
{}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (48dd8a7) 89.40% compared to head (1779737) 89.41%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4964      +/-   ##
============================================
+ Coverage     89.40%   89.41%   +0.01%     
- Complexity     6425     6430       +5     
============================================
  Files           683      683              
  Lines         20405    20427      +22     
============================================
+ Hits          18243    18265      +22     
  Misses         2162     2162              

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[HypeMC]

@sebastianbergmann Hi, any thoughts on this one? Judging by the few likes I got, there seems to be at least some interest in this feature. If there's anything else I can do here, please let me know.

[sebastianbergmann]

Merged manually, thanks!