Perf/simple flat

[asdacap]

• Not actually simple.
• Based on Perf/flat cache #9402 , brings compacted statediff, except the diff also include trie now.
• Works by having separate columns for flat and trie along with a trie node cache.
• Persistence is abstracted via IPersistence for very different db scheme.
• Slow trie commit time is mitigated via a complicated trie warmer.
• Maybe slower, maybe faster, hard to tell, take up more CPU, io and memory.
• No snap sync. Import only via "--FlatDb.ImportFromPruningTrieState true"

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