Priority for hook methods

[nikophil]

fixes #5889

I've introduced two new classes:

• PHPUnit\Metadata\Api\HookMethod: which is a value object with method's name and its priority
• PHPUnit\Metadata\Api\HookMethodsCollection which holds a collection of HookMethods, and will return methods as string with the right priority when iterating on it

HookMethods::hookMethods() will now return an array of HookCollections, and the handling of the priority will be delegated to this class.

BTW, I'm not really sure that PHPUnit\Metadata\Api\ is the right namespace for those classes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.20%. Comparing base (7af36fe) to head (1b94f00).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5890      +/-   ##
============================================
+ Coverage     94.17%   94.20%   +0.02%     
- Complexity     6597     6632      +35     
============================================
  Files           700      708       +8     
  Lines         19883    19980      +97     
============================================
+ Hits          18725    18822      +97     
  Misses         1158     1158              

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[sebastianbergmann]

Thank you!