trie, les, tests, core: implement trie tracer (#24403)

Trie tracer is an auxiliary tool to capture all deleted nodes
which can't be captured by trie.Committer. The deleted nodes
can be removed from the disk later.

trie/secure_trie.go

@@ -87,7 +87,7 @@ func (t *SecureTrie) TryGetNode(path []byte) ([]byte, int, error) {
 	return t.trie.TryGetNode(path)
 }
 
-// TryUpdate account will abstract the write of an account to the
+// TryUpdateAccount account will abstract the write of an account to the
 // secure trie.
 func (t *SecureTrie) TryUpdateAccount(key []byte, acc *types.StateAccount) error {
 	hk := t.hashKey(key)
@@ -185,8 +185,10 @@ func (t *SecureTrie) Hash() common.Hash {
 
 // Copy returns a copy of SecureTrie.
 func (t *SecureTrie) Copy() *SecureTrie {
-	cpy := *t
-	return &cpy
+	return &SecureTrie{
+		trie:        *t.trie.Copy(),
+		secKeyCache: t.secKeyCache,
+	}
 }
 
 // NodeIterator returns an iterator that returns nodes of the underlying trie. Iteration