Refactor/move process handling

[Nukesor]

Move all process handling related logic into the daemon.

This includes creating a new InternalState struct that wraps the old State struct.

State now no longer contains the children, callbacks or shutdown fields.

[codecov]

Codecov Report

Attention: Patch coverage is 85.53846% with 47 lines in your changes missing coverage. Please review.

Project coverage is 80.34%. Comparing base (a3519bd) to head (d6047e2).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
pueue/src/daemon/internal_state/state.rs	87.50%	23 Missing ⚠️
pueue/src/process_helper/mod.rs	12.50%	7 Missing ⚠️
...ueue/src/daemon/network/message_handler/enqueue.rs	45.45%	6 Missing ⚠️
pueue/src/daemon/network/message_handler/stash.rs	45.45%	6 Missing ⚠️
pueue/src/daemon/process_handler/finish.rs	71.42%	2 Missing ⚠️
pueue/src/daemon/mod.rs	83.33%	1 Missing ⚠️
pueue/src/daemon/process_handler/kill.rs	80.00%	1 Missing ⚠️
pueue_lib/src/state.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #607      +/-   ##
==========================================
- Coverage   80.54%   80.34%   -0.21%     
==========================================
  Files          78       78              
  Lines        5984     6018      +34     
==========================================
+ Hits         4820     4835      +15     
- Misses       1164     1183      +19     

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[github-actions]

Test Results

  3 files  ±0   19 suites  ±0   3m 21s ⏱️ -2s
174 tests ±0  174 ✅ ±0  0 💤 ±0  0 ❌ ±0 
366 runs  ±0  366 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit a42d833. ± Comparison against base commit a3519bd.

This pull request removes 7 and adds 7 tests. Note that renamed tests count towards both.

pueue-lib ‑ process_helper::platform::test::test_spawn_command
pueue-lib ‑ process_helper::unix::tests::test_normal_command_children_are_killed
pueue-lib ‑ process_helper::unix::tests::test_normal_command_is_killed
pueue-lib ‑ process_helper::unix::tests::test_shell_command_children_are_killed
pueue-lib ‑ process_helper::unix::tests::test_shell_command_is_killed
pueue-lib ‑ process_helper::unix::tests::test_shell_command_is_killed_with_signal
pueue-lib ‑ process_helper::unix::tests::test_spawn_command

pueue ‑ process_helper::platform::test::test_spawn_command
pueue ‑ process_helper::unix::tests::test_normal_command_children_are_killed
pueue ‑ process_helper::unix::tests::test_normal_command_is_killed
pueue ‑ process_helper::unix::tests::test_shell_command_children_are_killed
pueue ‑ process_helper::unix::tests::test_shell_command_is_killed
pueue ‑ process_helper::unix::tests::test_shell_command_is_killed_with_signal
pueue ‑ process_helper::unix::tests::test_spawn_command

♻️ This comment has been updated with latest results.