Use Pest instead of PHPT files

[henriquemoody]

Although I love PHPT files, and I've done my fair share of making it easier to write them in this library, they're very slow, and running them has become a hindrance.

I've been fidgeting with the idea of using Pest for a while, and I think it's the right tool for the job. I had to create a couple of functions to make it easier to run those tests, and now they're working really alright.

I migrated all the PHPT files into Pest files -- I automated most of the work with a little script using "nikic/php-parser"; this commit should contain all the previous PHPT tests as Pest tests.

The previous integration tests would take sixteen seconds, and the Pest tests take less than a second.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.55%. Comparing base (ea29c2c) to head (94daa8d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1495      +/-   ##
============================================
- Coverage     97.36%   96.55%   -0.81%     
  Complexity      967      967              
============================================
  Files           200      200              
  Lines          2354     2354              
============================================
- Hits           2292     2273      -19     
- Misses           62       81      +19     

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