scripted-diff: Move src/kernel/coinstats to kernel::

Introduces a new kernel:: namespace and move all of src/kernel/coinstats
under it.

In the verify script, lines like:

line="$(grep -n 'namespace node {' -- src/kernel/coinstats.h | tail -n1 | cut -d: -f1)"
sed -i -e "${line}s@namespace node {@namespace kernel {@" -- src/kernel/coinstats.h

Are intended to replace only the last instance of "namespace node" with
"namespace kernel", this is to avoid replacing forward declarations of
things inside the node:: namespace.

-BEGIN VERIFY SCRIPT-
sed -E -i 's@namespace node@namespace kernel@g' -- src/kernel/coinstats.cpp

line="$(grep -n 'namespace node {' -- src/kernel/coinstats.h | tail -n1 | cut -d: -f1)"
sed -i -e "${line}s@namespace node {@namespace kernel {@" -- src/kernel/coinstats.h

line="$(grep -n '// namespace node' -- src/kernel/coinstats.h | tail -n1 | cut -d: -f1)"
sed -i -e "${line}s@// namespace node@// namespace kernel@" -- src/kernel/coinstats.h

things='(CCoinsStats|CoinStatsHashType|GetBogoSize|TxOutSer|ComputeUTXOStats)'
git grep -lE 'node::'"$things" | xargs sed -E -i 's@node::'"$things"'@kernel::\1@g'
sed -E -i 's@'"$things"'@kernel::\1@g' -- src/node/coinstats.cpp src/node/coinstats.h
sed -E -i 's@BlockManager@node::\0@g' -- src/kernel/coinstats.cpp
-END VERIFY SCRIPT-

2 files changed, 4 insertions, 4 deletions

diff --git a/src/index/coinstatsindex.cpp b/src/index/coinstatsindex.cpp
index c4bc47e538..666eb4fdb0 100644
--- a/src/index/coinstatsindex.cpp
+++ b/src/index/coinstatsindex.cpp
@@ -12,10 +12,10 @@
 #include <undo.h>
 #include <validation.h>
 
-using node::CCoinsStats;
-using node::GetBogoSize;
+using kernel::CCoinsStats;
+using kernel::GetBogoSize;
 using node::ReadBlockFromDisk;
-using node::TxOutSer;
+using kernel::TxOutSer;
 using node::UndoReadFromDisk;
 
 static constexpr uint8_t DB_BLOCK_HASH{'s'};
diff --git a/src/index/coinstatsindex.h b/src/index/coinstatsindex.h
index 315f1fa14a..cae052d913 100644
--- a/src/index/coinstatsindex.h
+++ b/src/index/coinstatsindex.h
@@ -56,7 +56,7 @@ public:
     explicit CoinStatsIndex(size_t n_cache_size, bool f_memory = false, bool f_wipe = false);
 
     // Look up stats for a specific block using CBlockIndex
-    std::optional<node::CCoinsStats> LookUpStats(const CBlockIndex* block_index) const;
+    std::optional<kernel::CCoinsStats> LookUpStats(const CBlockIndex* block_index) const;
 };
 
 /// The global UTXO set hash object.