opt(bitmap): Lazy cardinality calculations in FastOr

[manishrjain]

Calculate cardinality at the end, instead of calculating it for every bitmap container OR. This is equivalent of the lazyOr in official roaring library.

This shows a 20% speed improvement for 50-th %-ile based on the data below, and makes it 3x faster than roaring64.

RealDataFastOr/census-income_srt-32         1.55ms ± 1%    1.00ms ± 1%  -35.15%  (p=0.016 n=5+4)
RealDataFastOr/census-income-32             1.65ms ± 3%    1.20ms ± 9%  -27.13%  (p=0.008 n=5+5)
RealDataFastOr/census1881_srt-32            3.00ms ± 2%    3.06ms ± 2%     ~     (p=0.095 n=5+5)
RealDataFastOr/census1881-32                2.94ms ± 2%    2.96ms ± 7%     ~     (p=1.000 n=5+5)
RealDataFastOr/dimension_003-32             13.7ms ± 2%    12.3ms ± 0%   -9.84%  (p=0.016 n=5+4)
RealDataFastOr/dimension_008-32             4.41ms ± 4%    3.75ms ± 3%  -15.01%  (p=0.008 n=5+5)
RealDataFastOr/dimension_033-32             3.54ms ± 3%    2.65ms ± 1%  -25.16%  (p=0.008 n=5+5)
RealDataFastOr/uscensus2000-32               780µs ± 2%     800µs ± 1%   +2.49%  (p=0.008 n=5+5)
RealDataFastOr/weather_sept_85_srt-32       4.10ms ± 2%    2.73ms ± 2%  -33.40%  (p=0.008 n=5+5)
RealDataFastOr/weather_sept_85-32           6.35ms ± 2%    4.76ms ±10%  -25.11%  (p=0.008 n=5+5)
RealDataFastOr/wikileaks-noquotes_srt-32    1.09ms ± 2%    1.06ms ± 3%   -2.90%  (p=0.008 n=5+5)
RealDataFastOr/wikileaks-noquotes-32        1.07ms ± 1%    0.91ms ± 2%  -15.24%  (p=0.008 n=5+5)

This change is