fix: avoid u32 overflow in statistics for full bitmaps#358
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Signed-off-by: Sai Asish Y <say.apm35@gmail.com>
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The n_values_array_containers and n_values_run_containers fields in Statistics are u32, but a bitmap can hold up to 2^32 values across its containers, so statistics() overflows for a full bitmap (panics with overflow checks on, wraps without). This widens both fields to u64 to match n_values_bitset_containers and cardinality, and drops the as u32 casts. Closes #357.