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When loading an index file with a corrupted or crafted header where
max_elements_ < cur_element_count, loadIndex allocates data_level0_memory_
for max_elements_ but reads cur_element_count * size_data_per_element_ bytes,
triggering a heap buffer overflow write.
Validate max_elements_ >= cur_element_count immediately after reading the
header, returning Status("Index seems to be corrupted or unsupported").
Also add test coverage verifying corrupted index headers are rejected safely.
Fixes nmslib#673
Signed-off-by: Ahmed <thlurte@gmail.com>
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