Add function for cloning packages and objects

[maier-m]

Proposal to add a D1Client function that will assist with cloning packages and objects.
See https://github.com/NCEAS/datamgmt/blob/master/R/clone_package.R for examples (which would be adjusted to achieve this proposal).

There are two use cases I can think of for needing this functionality.

1. Cloning between "STAGING" and "PROD" environments and vice versa
2. Manual replication between nodes (uncommon but useful for some nodes with restrictive replication policies like Arctic Data Center).

[gothub]

A vignette explaining when and how to use this function would be very helpful.

[maier-m]

@gothub The how would be simple for me to write. The when would require input from others if there are additional use cases beyond what I detailed above.

[gothub]

@maier-m the 'when' I was referring to is the two use cases that you listed. Others can certainly add to any vignette that is created for this.