Extend get_order_book API to return more info

[abitmore]

PR for #2637 and blocksights/blocksights-open-explorer#9.

This PR adds 4 data fields into the order struct:

• id - ID of the limit order
• owner_id - owner account ID of the limit order
• owner_name - owner account name of the limit order
• expiration - expiration time of the limit order

The full order struct becomes:

   struct order
   {
      string                     price;
      string                     quote;
      string                     base;
      limit_order_id_type        id;
      account_id_type            owner_id;
      string                     owner_name;
      time_point_sec             expiration;
   };

The order_book struct itself is unchanged.

   struct order_book
   {
     string                      base;
     string                      quote;
     vector< order >             bids;
     vector< order >             asks;
   };

[sonarcloud]

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