feat(foreground): Add foreground command

[hubertdeng123]

This adds the devservices foreground command.

If a service is up and running in a mode where there are supervisor programs, the devservices foreground command stops the daemonized supervisor process. It then brings it up in the foreground, allowing for easier interactive debugging.

When the foregrounded process is terminated, the daemonized process is restarted in the background.

Screen.Recording.2025-05-27.at.11.29.15.AM.mov

https://linear.app/getsentry/issue/DI-656/implement-devservices-foreground-command

[codecov]

Codecov Report

Attention: Patch coverage is 96.62921% with 3 lines in your changes missing coverage. Please review.

Project coverage is 95.13%. Comparing base (65db01d) to head (37aa337).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
devservices/commands/foreground.py	96.62%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #281      +/-   ##
==========================================
+ Coverage   95.08%   95.13%   +0.05%     
==========================================
  Files          27       28       +1     
  Lines        2379     2468      +89     
==========================================
+ Hits         2262     2348      +86     
- Misses        117      120       +3     

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[IanWoodard]

Looks pretty solid, had some comments about some edge cases. Good job testing as well!

[IanWoodard]

One last thing (utilize constants for colors), but after that, looks good to go