cleanup old blocks from cache in pruning routine #145
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Added a missing cleanup routine that removes block from the finalized block range from cache.
This 'should' never happen under normal conditions as the finalization routine is responsible for removing these block after processing.
However, there might be race conditions where a client receives a new block at the same time the finalization routine processes an epoch. That's clearly an edge case as new blocks even when orphaned usually do not arrive that late. But without the additional cleanup, these blocks would stay in memory forever.