Stream reference integrity check functionality

[m0ar]

For a given node, it's per the protocol spec invalid to update outgoing stream references. This is planned to being mitigated at the Ceramic level, but right now we prevent the update from being made with the API types.

To validate that a node hasn't been tampered with, we need a function that takes a streamID, iterates through the versions, and validates that stream references have not been updated.