Add benchmark

[natir]

I create this pull request to track the changes needed to set up a niffler benchmark and discuss these changes. #25

Main todolist:

• [X] bench format detection
• [X] bench reading of small stream in memory
• [x] bench writting of small stream in memory
• [x] bench reads of a file on disk
• [x] bench writting of a file on disk

Side effect todolist

• [x] write documentation of read_compression function

[codecov[bot]]

Codecov Report

Merging #25 into master will decrease coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #25      +/-   ##
==========================================
- Coverage   98.68%   98.64%   -0.04%     
==========================================
  Files           2        2              
  Lines         152      148       -4     
==========================================
- Hits          150      146       -4     
  Misses          2        2              

Impacted Files	Coverage Δ
src/compression.rs	98.46% <100.00%> (-0.54%)	:arrow_down:
src/lib.rs	98.79% <100.00%> (+0.71%)	:arrow_up:

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[natir]

I had to make the format detection function read_compression public, I'll have to write its documentation and maybe change its name to compression_detection @luizirber do you have an opinion about that name?

[natir]

To change where the file is write on disk set environement variable TMPDIR

[natir]

@luizirber If it's ok for you I think we can merge.

In think, the add of sniff in public API didn't break compatibility with the previous version so if we want create a new release the version number is 2.1.0. I think we don't need to create a new release for this little change.

[natir]

If you want correct typo I write in the documentation please do it :)

[luizirber]

@natir do the changes in https://github.com/luizirber/niffler/pull/25/commits/025c7c7411da17457b2504ba4878306f9920e998 look good? If yes, feel free to merge =]