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_test.go

@@ -112,8 +112,7 @@ func TestSecureTrieConcurrency(t *testing.T) {
 	threads := runtime.NumCPU()
 	tries := make([]*SecureTrie, threads)
 	for i := 0; i < threads; i++ {
-		cpy := *trie
-		tries[i] = &cpy
+		tries[i] = trie.Copy()
 	}
 	// Start a batch of goroutines interactng with the trie
 	pend := new(sync.WaitGroup)