[Storehouse] 015 - add util to extract payloadless

[zhangchiqing]

This PR adds a execution-state-extract-payloadless util to extract a v7 checkpoint (payloadless) from wal files.

It does not support migration, because migration can be done by generating a wal file with migrated trie updates.

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[zhangchiqing]

We use a different replay function because the original replay would always replay ALL wal files, even if we have found a trie root hash.

For instance, given we have a root.checkpoint.v7 file and 3 wal files: 000, 001, 002. And wal file 001 contains a trie update of root hash A. If we need to extract state for root hash A, the original replay would initialize the DiskWAL by replaying all 3 wal files, if 002 has 1000 trie updates, then the final forest will not include A. However, we could stop wal replaying as soon as replaying 001 and found root hash A, so that the final forest has A as last trie's root hash, and can be used for extracting state.