Fix Class "X" not found due to coroutine context switching in autoload

[Yurunsoft]

问题：

瞬间有多个协程 new 一个未被加载的类，如果 autoload 里有协程切换，就会报错 Class "X" not found。

解决方案：

hook zend_autoload()，当多个协程 autoload 同一个类时，协程挂起等待。

参考：swow/swow@beffeb4

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8a2dfcc) 72.94% compared to head (5888e84) 72.92%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5180      +/-   ##
==========================================
- Coverage   72.94%   72.92%   -0.03%     
==========================================
  Files          69       69              
  Lines       14855    14855              
==========================================
- Hits        10836    10833       -3     
- Misses       4019     4022       +3     

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