Dynamic min-relay-fee and dust amount (#280)

* [btc-embedded] add chainfee.Estimator and extraAPI interfaces

* dynamic fee amount

* dynamic dust amount

* [client] fix linter errors

* [domain] fix unit tests

* [server] return dust amount in GetInfo RPC

* [sdk] fix lnd dependencie

* go work sync

* fix witness stack size forfeit tx size estimator

* remove hardcoded fee values in covenant txbuilder

* lower liquid feerate

* fix after reviews

* go work sync

api-spec/openapi/swagger/ark/v1/service.swagger.json

@@ -640,7 +640,7 @@
         "network": {
           "type": "string"
         },
-        "minRelayFee": {
+        "dust": {
           "type": "string",
           "format": "int64"
         },
@@ -880,6 +880,9 @@
         },
         "unsignedTree": {
           "$ref": "#/definitions/v1Tree"
+        },
+        "unsignedRoundTx": {
+          "type": "string"
         }
       }
     },