move-only: Move ThreadImport to blockstorage

Can be reviewed with the git options
--color-moved=dimmed-zebra --color-moved-ws=ignore-all-space

src/node/blockstorage.h

@@ -0,0 +1,19 @@
+// Copyright (c) 2011-2021 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_NODE_BLOCKSTORAGE_H
+#define BITCOIN_NODE_BLOCKSTORAGE_H
+
+#include <vector>
+
+#include <fs.h>
+
+class ArgsManager;
+class ChainstateManager;
+
+static constexpr bool DEFAULT_STOPAFTERBLOCKIMPORT{false};
+
+void ThreadImport(ChainstateManager& chainman, std::vector<fs::path> vImportFiles, const ArgsManager& args);
+
+#endif // BITCOIN_NODE_BLOCKSTORAGE_H