[fastx client] Synchronise certificates with authorities before making move call and publish

[patrickkuo]

We should make sure the authorities have all the necessary certificates before making move call, like how it's done in communicate_transfer

[gdanezis]

The issue here is related to this issue: #290

[gdanezis]

This issue was closed by mistake :(

[patrickkuo]

The sync should be working for move calls and publish after this refactoring #269, however this is still using sequence number determine the missing certificates, which is incorrect, stated in this issue #290

[gdanezis]

Yep, I will next go in and try to fix all this using the sync functions we just build as well as more local state that we now have at hand. In terms of local state what would be very useful is:

• the Objects involved in an order, which contain the parent_transaction.
• a map of certs by digest, that we can use as a local cache.