Use BitChunks in equal_bits

[tustvold]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

arrow::array::equal::utils::equal_bits currently is implemented as

(0..len).all(|i| {
        bit_util::get_bit(lhs_values, lhs_start + i)
            == bit_util::get_bit(rhs_values, rhs_start + i)
    })

This is likely extremely sub-optimal, performing a large number of operations for every bit

Describe the solution you'd like

Something like the below, not tested, should be significantly faster

let lhs = BitChunks::new(lhs_values, lhs_start, len);
let rhs = BitChunks::new(rhs_values, rhs_start, len);

for (a, b) in lhs.iter().zip(rhs.iter()) {
    if a != b {
        return false
    }
}

lhs.remainder_bits() == rhs.remainder_bits()

Describe alternatives you've considered

We could not do this