Move of built-in implementation helpers to jerry-core/ecma/builtin-objects

[ruben-ayrapetyan]

There are some built-in implementation helpers in jerry-core/ecma/operations/ecma-array-prototype.cpp.

The helpers should be moved to jerry-core/ecma/builtin-objects.

If they are related to different built-ins, then, maybe, to ecma-builtin-helpers.cpp,
otherwise - to the module with corresponding built-in implementation as static function.