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[stdlib] Add take_items() method to List

This adds a take_items() method to List that returns an iterator draining
the list by moving elements out. Similar to Dict.take_items(), this allows
efficient transfer of elements without copying.

Changes:
- Added _ListTakeIter struct that moves elements using take_pointee()
- Added List.take_items() method returning the draining iterator
- Added comprehensive tests for basic usage, empty list, partial iteration,
  and bounds reporting

Fixes modular#5312
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Signed-off-by: Dalton Alexandre <166029845+dl-alexandre@users.noreply.github.com>