feat(proto): add publisher ICO order flow

market/v1/msg.proto

@@ -71,6 +71,7 @@ message MarketOrder {
   repeated string tags = 20;
   repeated string comment = 21;
   optional MarketOrder source = 22; // purchase is done via this field
+  bool is_ico = 23;
   // repeated string attachments = 14; // possible files included by
   // seller/buyer
 }
@@ -130,6 +131,7 @@ message NewMarketReq {
   MarketOrderSide side = 8;
   // TODO: maker market order as optional
   optional uint64 maker_order_id = 9;
+  bool is_ico = 10;
 }
 
 enum MarketOrdersSortBy {
@@ -164,6 +166,7 @@ message OrderListFilter {
   optional MarketOrdersSortBy sort_by = 19;
   optional uint32 page_no = 21;
   optional uint32 page_size = 22;
+  optional bool is_ico = 23;
 }
 
 /* Contract */