Support native pathlike objects

[alecandido]

This should close #84.

It's a tiny PR, and we can even quickly merge.
I ran existing tests, and slightly extended (sorry for the diff, but someone forgot to run black on unit tests).
I even tested it manually, and it's smoothly working.

Speaking of tests: maybe it might be a good chance to extend the IO related ones a bit (write_lz4 is not tested, nor read, write and write_lz4 for FkTables... actually almost nothing is tested of Fk).
In any case: the interface is a thin wrapper, so an extensive test suite is not that required, and we can even postpone to a more consistent tests rework.

[codecov]

Codecov Report

Merging #105 (5c22c2f) into master (c0144e4) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
+ Coverage   88.40%   88.46%   +0.06%     
==========================================
  Files          31       31              
  Lines        3070     3070              
==========================================
+ Hits         2714     2716       +2     
+ Misses        356      354       -2     

Impacted Files	Coverage Δ
pineappl_cli/src/plot.rs	93.15% <0.00%> (+1.05%)	⬆️

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[cschwan]

Looks good to me!

[cschwan]

Speaking of tests: maybe it might be a good chance to extend the IO related ones a bit (write_lz4 is not tested, nor read, write and write_lz4 for FkTables... actually almost nothing is tested of Fk).
In any case: the interface is a thin wrapper, so an extensive test suite is not that required, and we can even postpone to a more consistent tests rework.

Agreed, I've opened Issue #108 for that. Thanks for your work on this Issue @alecandido!