add execution block hash index to block cache #144
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This PR adds a execution block hash to block reference map to the block cache.
This map significantly lowers the processing time for the
getBlocksByExecutionBlockHashfunction, which is more heavily used with #141.The negative effect of this change is the memory overhead.
The map holds all execution hashes & references to blocks for all unfinalized blocks,
which roughly sums up to about 2.5M memory for a week of unfinality (50k blocks).
I think the overhead is acceptable compared to iterating the full unfinalized block range for each call to
getBlocksByExecutionBlockHash.