[FR] - Add support for reading checkpoint data

[dnadales]

Internal/External
Internal if an IOHK staff member.

Area
Other Any other topic (Delegation, Ranking, ...).

Describe the feature you'd like

Implement a solution allowing checkpoint data to be provided to the node such that:

• The checkpoint data contains a list of blocks which must be present in the chain.
• If we encounter a chain which would exclude a block in this list, we will consider it invalid.

The functionality already exists in Consensus (IntersectMBO/ouroboros-consensus#898), remaining work is to (optionally) parse the relevant checkpoint data and propagate them to Consensus.

Sketch: Optionally, the node config file can contain a path to a file containing the snapshots, eg

20 deadbeef
30 beefdead

indicating checkpoint hashes for block numbers 20 and 30.

[github-actions]

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