Commits on Aug 3, 2023

1. feat(oppool): Return reorged ops to the mempool …

   Previously, ops could be lost forever if they were mined into a block,
   but then that block got reorged away. Now, we detect reorgs and return
   any ops contained in them to our mempool.
   
   This requires some involved changes:
   
   * We replace the entire `events` mod and all its listeners. Instead, we
     introduce a new type, `Chain`, which represents our current knowledge
     of what blocks make up the blockchain.
   * We watch for the latest block hash to change. When it does, we read
     backwards from the latest block until we connect back to our known
     blocks, which lets us see any blocks that were replaced as well.
   * This process produces a `ChainUpdate` event, which is sent to the op
     pool (replacing `NewBlockEvent`). This may cause the op pool to not
     only remove mined ops but also restore unmined ops.
   * In order for the op pool to do so, it remembers mined ops for a time
     rather than deleting them fully. We add new methods to the op pool for
     restoring unmined blocks to make this possible.

   

   dphilipson committed Aug 3, 2023
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