Add support for Apple M4

[Copilot]

Apple M4 chips were not recognized in the Apple Silicon detection logic, causing M4 users to receive incorrect install instructions when powermetrics wasn't configured.

Changes

• codecarbon/core/resource_tracker.py: Added "M4" to the Apple Silicon chip check in _get_install_instructions. Also refactored the chained or conditions to use any() for maintainability:

  # Before
  if "M1" in cpu_model or "M2" in cpu_model or "M3" in cpu_model:
  
  # After
  if any(chip in cpu_model for chip in ("M1", "M2", "M3", "M4")):

• docs/introduction/methodology.md: Updated Apple Silicon chip list from (M1, M2) to (M1, M2, M3, M4).

Note: The powermetrics-based power measurement itself already supports any Apple chip via a generic "Apple" prefix check — only the fallback messaging and docs needed updating.

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[SaboniAmine]

LGTM, thanks! You could also add the M5 reference too, as they are now available to the public.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.57%. Comparing base (a6de0ba) to head (7c4da32).
⚠️ Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1112      +/-   ##
==========================================
+ Coverage   78.25%   78.57%   +0.31%     
==========================================
  Files          38       38              
  Lines        3638     3640       +2     
==========================================
+ Hits         2847     2860      +13     
+ Misses        791      780      -11     

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[benoit-cty]

Switched to a RegExp so M10 is already supported :D