Refactor/cliff/dev op

[cliff0412]

use stackTrie when committing genesis storage trie nodes

stackTrie only traverse mpt once while trie performs one traverse to hash first and then perform one commit; therefore, trie allocs more memory in saving the direty nodes. below is the bench result

stackTrie

// BenchmarkStackTrieInsertion/Size_1000
// BenchmarkStackTrieInsertion/Size_1000-12 739 1617923 ns/op 582738 B/op 9122 allocs/op
// BenchmarkStackTrieInsertion/Size_10000
// BenchmarkStackTrieInsertion/Size_10000-12 70 16953160 ns/op 5805821 B/op 92059 allocs/op
// BenchmarkStackTrieInsertion/Size_100000
// BenchmarkStackTrieInsertion/Size_100000-12 6 177203236 ns/op 61306298 B/op 917144 allocs/op
// BenchmarkStackTrieInsertion/Size_1000000
// BenchmarkStackTrieInsertion/Size_1000000-12 1 1964037625 ns/op 582744808 B/op 9085699 allocs/op

regular trie

// BenchmarkRegularTrieInsertion/Size_1000
// BenchmarkRegularTrieInsertion/Size_1000-12 482 2429196 ns/op 2080139 B/op 27682 allocs/op
// BenchmarkRegularTrieInsertion/Size_10000
// BenchmarkRegularTrieInsertion/Size_10000-12 70 16680217 ns/op 20157853 B/op 275211 allocs/op
// BenchmarkRegularTrieInsertion/Size_100000
// BenchmarkRegularTrieInsertion/Size_100000-12 6 180554403 ns/op 207196216 B/op 2741910 allocs/op
// BenchmarkRegularTrieInsertion/Size_1000000
// BenchmarkRegularTrieInsertion/Size_1000000-12 1 2423703250 ns/op 2099059016 B/op 27041567 allocs/op

alloc: stackTrie allocs 582744808 bytes per op, while regular trie alloc 2099059016 bytes per op, which is 3.6x less
speed: stackTrie takes 1964037625 ns per op, while regular trie takes 2423703250 ns, which is 23% faster