refactor: Modularize shamap and nodestore (#5668)

This change moves the shamap and nodestore from `xrpld` to `libxrpl`.

include/xrpl/shamap/SHAMapTxLeafNode.h

@@ -0,0 +1,88 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2012, 2013 Ripple Labs Inc.
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#ifndef RIPPLE_SHAMAP_SHAMAPTXLEAFNODE_H_INCLUDED
+#define RIPPLE_SHAMAP_SHAMAPTXLEAFNODE_H_INCLUDED
+
+#include <xrpl/basics/CountedObject.h>
+#include <xrpl/protocol/HashPrefix.h>
+#include <xrpl/protocol/digest.h>
+#include <xrpl/shamap/SHAMapItem.h>
+#include <xrpl/shamap/SHAMapLeafNode.h>
+
+namespace ripple {
+
+/** A leaf node for a transaction. No metadata is included. */
+class SHAMapTxLeafNode final : public SHAMapLeafNode,
+                               public CountedObject<SHAMapTxLeafNode>
+{
+public:
+    SHAMapTxLeafNode(
+        boost::intrusive_ptr<SHAMapItem const> item,
+        std::uint32_t cowid)
+        : SHAMapLeafNode(std::move(item), cowid)
+    {
+        updateHash();
+    }
+
+    SHAMapTxLeafNode(
+        boost::intrusive_ptr<SHAMapItem const> item,
+        std::uint32_t cowid,
+        SHAMapHash const& hash)
+        : SHAMapLeafNode(std::move(item), cowid, hash)
+    {
+    }
+
+    intr_ptr::SharedPtr<SHAMapTreeNode>
+    clone(std::uint32_t cowid) const final override
+    {
+        return intr_ptr::make_shared<SHAMapTxLeafNode>(item_, cowid, hash_);
+    }
+
+    SHAMapNodeType
+    getType() const final override
+    {
+        return SHAMapNodeType::tnTRANSACTION_NM;
+    }
+
+    void
+    updateHash() final override
+    {
+        hash_ =
+            SHAMapHash{sha512Half(HashPrefix::transactionID, item_->slice())};
+    }
+
+    void
+    serializeForWire(Serializer& s) const final override
+    {
+        s.addRaw(item_->slice());
+        s.add8(wireTypeTransaction);
+    }
+
+    void
+    serializeWithPrefix(Serializer& s) const final override
+    {
+        s.add32(HashPrefix::transactionID);
+        s.addRaw(item_->slice());
+    }
+};
+
+}  // namespace ripple
+
+#endif