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kernel: Add notification interface
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Authored by PiRK on Thu, May 23, 09:15.

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Fabien
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rABC61686971b5df: kernel: Add notification interface
Summary

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.

This is a backport of core#27636
https://github.com/bitcoin/bitcoin/pull/27636/commits/447761c8228d58f948aae7e73ed079c028cacb97

Test Plan

With bitcoin-chainstate:
ninja all check-all

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