Add Quote Expiry information #99
Description
To make it easier for clients to understand the lifetime of a quote, we should add optional expiry information to the quote (as signed data so the FX anchor can validate that).
The expiry information should include:
- Server time (to serve as a reference clock), with milliseconds level precision
- Time to live or Expiry Time, with milliseconds level precision
The server, when receiving a quote-based request from a client, should calculate whether the quote is expired and use that as the default basis of rejection for the default implementation of the callback in #98