kernel: Add notification interface

This commit is part of the libbitcoinkernel project and seeks to remove
the ChainstateManager's and, more generally, the kernel library's
dependency on interface_ui with options methods in this and the following
few commits. By removing interface_ui from the kernel library, its
dependency on boost is reduced to just boost::multi_index.

Define a new kernel notification class with virtual methods for
notifying about internal kernel events. Create a new file in the node
library for defining a function creating the default set of notification
methods such that these do not need to be re-defined all over the
codebase. As a first step, add a `blockTip` method, wrapping
`uiInterface.NotifyBlockTip`.

src/node/context.cpp

@@ -11,6 +11,7 @@
 #include <net.h>
 #include <net_processing.h>
 #include <netgroup.h>
+#include <node/kernel_notifications.h>
 #include <policy/fees.h>
 #include <scheduler.h>
 #include <txmempool.h>

src/node/context.h

@@ -30,6 +30,8 @@ class WalletLoader;
 } // namespace interfaces
 
 namespace node {
+class KernelNotifications;
+
 //! NodeContext struct containing references to chain state and connection
 //! state.
 //!
@@ -62,6 +64,7 @@ struct NodeContext {
     interfaces::WalletLoader* wallet_loader{nullptr};
     std::unique_ptr<CScheduler> scheduler;
     std::function<void()> rpc_interruption_point = [] {};
+    std::unique_ptr<KernelNotifications> notifications;
 
     //! Declare default constructor and destructor that are not inline, so code
     //! instantiating the NodeContext struct doesn't need to #include class

src/node/kernel_notifications.cpp

@@ -0,0 +1,16 @@
+// Copyright (c) 2023 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <node/kernel_notifications.h>
+
+#include <node/interface_ui.h>
+
+namespace node {
+
+void KernelNotifications::blockTip(SynchronizationState state, CBlockIndex& index)
+{
+    uiInterface.NotifyBlockTip(state, &index);
+}
+
+} // namespace node

src/node/kernel_notifications.h

@@ -0,0 +1,21 @@
+// Copyright (c) 2023 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_KERNEL_NOTIFICATIONS_H
+#define BITCOIN_NODE_KERNEL_NOTIFICATIONS_H
+
+#include <kernel/notifications_interface.h>
+
+class CBlockIndex;
+enum class SynchronizationState;
+
+namespace node {
+class KernelNotifications : public kernel::Notifications
+{
+public:
+    void blockTip(SynchronizationState state, CBlockIndex& index) override;
+};
+} // namespace node
+
+#endif // BITCOIN_NODE_KERNEL_NOTIFICATIONS_H