Add support for unilateral exit (#79)

* v0 unilateral redemption

* add fee outputs to congestion tree

* unilateral exit

* rework unilateral exit verbosity

* substract fee from vtxo amount

* remove unused functions and variables

* fix after reviews

* Update noah/explorer.go

Co-authored-by: Pietralberto Mazza <18440657+altafan@users.noreply.github.com>
Signed-off-by: Louis Singer <41042567+louisinger@users.noreply.github.com>

* remove bufferutils

---------

Signed-off-by: Louis Singer <41042567+louisinger@users.noreply.github.com>
Co-authored-by: Pietralberto Mazza <18440657+altafan@users.noreply.github.com>

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

@@ -558,6 +558,9 @@
         },
         "spent": {
           "type": "boolean"
+        },
+        "poolTxid": {
+          "type": "string"
         }
       }
     }

asp/api-spec/openapi/swagger/ocean/v1/transaction.swagger.json

@@ -262,14 +262,6 @@
         }
       }
     },
-    "v1SignPsetWithSchnorrKeyResponse": {
-      "type": "object",
-      "properties": {
-        "signedTx": {
-          "type": "string"
-        }
-      }
-    },
     "v1SignTransactionResponse": {
       "type": "object",
       "properties": {