Read from a TileDB VFS FilehandleSource:
This interface currently defaults to reading an integer vector. This is suitable for R objects
as a raw vector used for (de)serialization can be mapped easily to an integer vector. It is
also possible to
memcpy to the contiguous memory of an integer vector should other
(non-R) data be transferred.
tiledb_vfs_read(fh, offset, nbytes, ctx = tiledb_get_context())
A TileDB VFS Filehandle external pointer as returned from
A scalar integer64 value with the byte offset from the beginning of the file with a of zero.
A scalar integer64 value with the number of bytes to be read.
(optional) A TileDB Ctx object