Simpler IPC API

[jorgecarleitao]

This PR removes from the public API internal methods and exposes them with more intuitive APIs.

This reduces the mental load of the IPC API public surface to users, thereby allowing them to more easily use the crate.

It also makes it easier to read from flight, as all utilities to do so are now available under io::flight.

[codecov]

Codecov Report

Merging #1208 (ffcc0c2) into main (497d431) will decrease coverage by 0.16%.
The diff coverage is 72.18%.

@@            Coverage Diff             @@
##             main    #1208      +/-   ##
==========================================
- Coverage   83.49%   83.32%   -0.17%     
==========================================
  Files         356      357       +1     
  Lines       37081    37159      +78     
==========================================
+ Hits        30961    30964       +3     
- Misses       6120     6195      +75     

Impacted Files	Coverage Δ
src/io/flight/mod.rs	37.64% <0.00%> (-29.36%)	⬇️
src/io/ipc/read/file_async.rs	61.19% <ø> (ø)
src/io/ipc/read/reader.rs	94.66% <ø> (-1.32%)	⬇️
src/mmap/mod.rs	84.84% <ø> (ø)
src/io/ipc/read/file.rs	97.32% <97.32%> (ø)
src/io/ipc/read/array/boolean.rs	90.74% <0.00%> (-7.41%)	⬇️
src/bitmap/immutable.rs	86.41% <0.00%> (+0.61%)	⬆️
src/bitmap/utils/slice_iterator.rs	98.78% <0.00%> (+1.21%)	⬆️
src/array/binary/mod.rs	90.12% <0.00%> (+1.23%)	⬆️

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