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06e373e272
In preparation for caching index objects, manage them under LSA. Implementation notes: key_view was changed to be a view on managed_bytes_view instead of bytes, so it now can be fragmented. Old users of key_view now have to linearize it. Actual linearization should be rare since partition keys are typically small. Index parser is now not constructing the index_entry directly, but produces value objects which live in the standard allocator space: class parsed_promoted_index_entry; calss parsed_partition_index_entry; This change was needed to support consumers which don't populate the partition index cache and don't use LSA, e.g. sstable::generate_summary(). It's now consumer's responsibility to allocate index_entry out of parsed_partition_index_entry.