fix: concurrent env access #1409
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This is an attempt at fixing #1395 #1061 #1353
The idea is basically to sandbox the environment on a per-thread basis and to not flush
$_ENVvalues in worker mode.This still allows
putenvto affect the actual environment (in case of forking). It does not fully resolve all environment races in ZTS, but will resolve all races for$_ENV,$_SERVERand throughgetenv().