Blockchain import/export

[gavofyork]

Should be a CLI option --export-chain which will dump the serialised blocks Vec<u8> as Slicable to output. Should be a corresponding --import-chain option which will import the blocks.

The specific encoding should be for block: SpecialisedBlock in blockchain.iter() { block.encode().encode() }. The first encode gets a Vec<u8> which is runtime/format agnostic. The second encode essentially just prepends the length of the Vec so that it can be read from a stream without a more complex container format.

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Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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