Improved debug repr of buffers and bitmaps.

[jorgecarleitao]

This makes the representation of buffers and bitmaps more useful.

Examples:

let buffer = MutableBuffer::<i32>::from(&[0, 1, 2, 3]);
assert_eq!(format!("{:?}", buffer), "[0, 1, 2, 3]")

let b = Bitmap::from([true, true, false, true, true, true, true, true, true]);
assert_eq!(format!("{:?}", b), "[0b11111011, 0b_______1]");
let b = b.slice(2, 7);

assert_eq!(format!("{:?}", b), "[0b111110__, 0b_______1]");

The bitmap representation ensures that the bitmap is shown as it is represented in bits, but pads with _ any bits that are not visible either due to its offset or length.

We lose the pointer, capacity, offset and the full data in sliced, which imo for most use-cases is not really needed. OTOH, it makes it much easier to read.

[codecov]

Codecov Report

Merging #284 (5768e09) into main (d1a5025) will increase coverage by 0.21%.
The diff coverage is 98.00%.

@@            Coverage Diff             @@
##             main     #284      +/-   ##
==========================================
+ Coverage   77.24%   77.46%   +0.21%     
==========================================
  Files         254      255       +1     
  Lines       20733    20916     +183     
==========================================
+ Hits        16016    16203     +187     
+ Misses       4717     4713       -4     

Impacted Files	Coverage Δ
src/bitmap/utils/mod.rs	100.00% <ø> (ø)
src/bitmap/utils/fmt.rs	96.87% <96.87%> (ø)
src/bitmap/immutable.rs	88.23% <100.00%> (+0.89%)	⬆️
src/bitmap/mutable.rs	92.63% <100.00%> (+0.46%)	⬆️
src/buffer/immutable.rs	97.50% <100.00%> (+0.23%)	⬆️
src/buffer/mutable.rs	91.94% <100.00%> (+0.18%)	⬆️
src/compute/nullif.rs	0.00% <0.00%> (-1.82%)	⬇️
src/io/csv/write/mod.rs	88.88% <0.00%> (+1.38%)	⬆️
src/io/json_integration/schema.rs	54.62% <0.00%> (+12.50%)	⬆️

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