dissect: Introduce --copy-ownership= to configure chown behavior

dissect: Introduce --copy-ownership= to configure chown behavior

Currently, if we're copying a file, we won't copy the owner UID/GID
from the source. If we're copying a directory, we will copy the owner
UID/GID from the source. Let's give users a bit more control over this
behavior by introducing --copy-ownership= which will default to the
current behavior but allows users to explicitly enable/disable copying
of ownership.