feat(bsk): support drop to upload

crates/bsk-protocol/schema/tool_upload_params.json

@@ -13,6 +13,9 @@
         "$ref": "#/definitions/UploadFile"
       }
     },
+    "mode": {
+      "$ref": "#/definitions/UploadMode"
+    },
     "ref": {
       "type": [
         "string",
@@ -65,6 +68,13 @@
           "type": "string"
         }
       }
+    },
+    "UploadMode": {
+      "type": "string",
+      "enum": [
+        "input",
+        "drop"
+      ]
     }
   }
 }