Extend from nonoverlapping

[orxfun]

extend_from_nonoverlapping method extends the pinned vector by copying count * size_of::<T>() bytes from src to self. The source and destination may not overlap.

This method can be considered as a combination of [extend] and [copy_from_nonoverlapping] methods such that:

• it takes the elements from src and writes them to this vector by memcpy;
• however, it does add these elements to the end of this vector which grows as needed.