Fixed int32 underflow on DateTime::createFromTimestamp (#12775)

* Fixed int32 underflow on DateTime::createFromTimestamp

[skip ci] Skip failing date test on 32-bit

Fix date createFromTimestamp test (#12766)

Unfortuantely, PHP_INT_MIN cannot be expressed as a literal in PHP, because -NUM
is parsed as (-)(NUM). NUM is restricted to PHP_INT_MAX.

Added DateTime[Immutable]::createFromTimestamp / date_create_[immutable]_from_timestamp