Add processor() method to UNameAPI trait

[naoNao89]

Adds processor() method that maps machine architecture strings to processor types, matching GNU coreutils behavior.

Fixes uutils/coreutils#8659

Example

let info = PlatformInfo::new()?;
let processor = info.processor(); // "arm" on macOS arm64, "aarch64" on Linux ARM64

This enables uutils/coreutils PR #8842 to migrate from local mapping to platform-info abstraction.

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 93.75%. Comparing base (dddde16) to head (f0bb916).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #96      +/-   ##
==========================================
+ Coverage   93.32%   93.75%   +0.42%     
==========================================
  Files           4        5       +1     
  Lines         734      784      +50     
==========================================
+ Hits          685      735      +50     
  Misses         49       49              

Flag	Coverage Δ
macos_latest	99.35% <100.00%> (+0.19%)	:arrow_up:
ubuntu_latest	99.37% <100.00%> (+0.18%)	:arrow_up:
windows_latest	92.99% <100.00%> (+0.40%)	:arrow_up:

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[sylvestre]

please also update: https://github.com/uutils/platform-info/blob/main/README.md

[naoNao89]

@sylvestre Updated! README now includes processor() in the example code and output.

[sylvestre]

give what Colin wrote in https://github.com/uutils/coreutils/pull/8842 not sure we should do it, sorry

[RGBCube]

Why not? If you want distros to start using it, you need to make it compatible. uutils has its own extensions too, and implements many other GNU extensions.

[sylvestre]

see: https://github.com/uutils/coreutils/pull/8842#issuecomment-3384684221 (Note that Collin is GNU coreutils upstream)

Anyway, we can still merge this feature in this crate and not use it in the coreutils