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566. By Laurynas Biveinis

Add new handler methods for notifying storage engine of imminent index
scans, both for reading whole table and ranges. Implements

The new handler methods added, no-ops in default implementations:
- prepare_index_scan for imminent index (range-less) scan, called in
rr_index_first, rr_index_last in records.cc, and
- prepare_range_scan for imminent index range scan, called in
- prepare_index_key_scan_map and prepare_index_key_scan for imminent
index (range-less) scan with used key part information, called in
join_read_always_key in sql_executor.cc.

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