Rename the `diffutils` binary to `diff`,

[oSoMoN]

in preparation for the future implementation of other binaries (cmp, sdiff and diff3)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 16 lines in your changes missing coverage. Please review.

Project coverage is 75.06%. Comparing base (d362046) to head (9a7d8c8). Report is 31 commits behind head on main.

Files with missing lines	Patch %	Lines
tests/integration.rs	0.00%	0 Missing and 16 partials :warning:

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Flag	BASE (d362046)	HEAD (9a7d8c8)
ubuntu_latest	2	1
macos_latest	2	0
windows_latest	2	1

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #75      +/-   ##
==========================================
- Coverage   82.48%   75.06%   -7.42%     
==========================================
  Files          10       10              
  Lines        2935     2876      -59     
  Branches      744      744              
==========================================
- Hits         2421     2159     -262     
  Misses        495      495              
- Partials       19      222     +203     

Flag	Coverage Δ
macos_latest	?
ubuntu_latest	75.45% <0.00%> (ø)
windows_latest	15.41% <0.00%> (ø)

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[sylvestre]

what is your plan here? Create new binaries ?

What about doing the same as coreutils ? One main binaries (or individual programs) and if you do ln -s diffutils diff or ln -s diffutils cmp, it will change the behavior of the command.

[oSoMoN]

I was thinking of individual binaries, but I must admit I didn't look at how it's done for coreutils, and I suppose it makes sense to do something similar. I'll take a look later, in the meantime I'm leaving this PR open.

[sylvestre]

the main adv is the size of the binaries as Rust bins have a tendency to be bigger than C :)

[oSoMoN]

Closing, as this is definitely being obsoleted by Gustavo's work in #88.