* Add support for custom NDArray memory management

Credit to @icemelon9 and @wweic

* Fix copy-paste issue

* Fix naive allocator.h

* Remove buffer field

* Apply Wei's suggestions.

Co-Authored-By: jroesch <roeschinc@gmail.com>

* Fix Wei's suggestion

* Fix go rts

* Break MM dependency

* Add docs and clean up diff

* Add more docs

* Move to VM folder

* Fix lint

* Remove Go dep.

* Rename to Empty

* Address Haichen's comments