[FEATURE] Bootstrap from a specific height

[zhangchiqing]

Issue to be solved

The archive node can not replace the historical EN, because the bootstrap phase assumes the checkpoint file is for the root block, but actually for historical EN, the checkpoint is for the last sealed block.

RN currently doesn't have the ability to bootstrap from a certain block with the checkpoint at that block.

we need to be able to specify the start-index-height and checkpoint-file flag, and allow the RN to bootstrap by importing the checkpoint and index the payloads with the specified height.
If they are not specified, then the height is chain.Root, and checkpoint file is just root.checkpoint file.
If they are specified, then it will be ignored if the database has already been bootstrapped.
If they are specified, the checkpoint file should only contain a single trie.

Suggest A Solution

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What are you currently working on that this is blocking?

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