Commits on Jun 5, 2024

1. fix: provide a safe way to obtain leaf index from mmrIndex …

   When the merklebuilder is adding a node it is guaranteed that the before
   and after mmrIndex are also valid mmrSizes. This lets it use LeafCount
   to directly obtain the leafIndex of the item just added.
   
   This led to the regular use of LeafCount as the way to get the leaf
   index. It is not safe to do this in general.
   
   This change adds FirstMMRSize which returns the size of the smallest
   valid MMR which containes the node identified by mmrIndex
   
   To provide a clear idiom for safely getting the leaf index from a node
   index (mmrIndex), LeafIndex(mmrIndex) is additionaly provided as a
   convenience for
   
     LeafCount(FirstMMRSize(mmrIndex)) - 1
   
   AB#9551

   Robin Bryce committed Jun 5, 2024
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