Nakamoto: Chain State Table for Nakamoto Headers

[kantai]

This is a new table in the same SQLite db as the current StacksChainState
block headers DB. It should be accessed through a new struct NakamotoChainState.
Each row of this table should store NakamotoStacksBlockHeader data, keyed by
StacksBlockId.

This should be a MARFed data store to assist with ancestor queries.

[saralab]

Closing, this has been merged in #3992

[blockstack-devops]

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