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Introduce Full and Rolling mode

This MR allows a node to run with a pruned history by introducing two history modes: Full (the new default mode) and Rolling. The Archive history mode corresponds to the current mode which keeps everything.

The node history is cleaned when setting a new checkpoint :

  • On Full mode, blocks below the new checkpoint are pruned and the node is still able to obtain some block data, such as the block header, under the new checkpoint.
  • On Rolling mode, only a minimal required portion of the blocks (max_op_ttl blocks under the new checkpoint) are kept and pruned. All blocks under this limit are deleted.

More info can be found in this post:

The snapshot part will be the subject of a separate MR.

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