feat(tui): improve logging

[orhun]

Description

This PR improves the logging by using the log crate for events and also adds logging for the TUI.

Motivation and Context

Closes #11

How Has This Been Tested?

Unit tests.

Screenshots / Logs (if applicable)

TBA.

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have formatted the code with rustfmt.
• I checked the lints with clippy.
• I have added tests to cover my changes.
• All new and existing tests passed.

Todos:

• Add an argument for systeroid-tui for specifying the output file for logs
• Add trace logs for systeroid-core
• Possibly update the logger style for systeroid-tui
• Update documentation about logging (RUST_LOG) and logger widget key bindings

[codecov-commenter]

Codecov Report

Patch coverage: 39.07% and project coverage change: -2.70 ⚠️

Comparison is base (80be6c5) 79.64% compared to head (448fde8) 76.94%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #83      +/-   ##
==========================================
- Coverage   79.64%   76.94%   -2.70%     
==========================================
  Files          23       23              
  Lines        1429     1500      +71     
==========================================
+ Hits         1138     1154      +16     
- Misses        291      346      +55     

Flag	Coverage Δ
unit-tests	76.94% <39.07%> (-2.70%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
systeroid-tui/tests/integration_test.rs	100.00% <ø> (ø)
systeroid/src/main.rs	0.00% <0.00%> (ø)
systeroid-tui/src/command.rs	76.82% <11.77%> (-21.26%)	⬇️
systeroid/src/app.rs	62.61% <25.00%> (ø)
systeroid-tui/src/app.rs	63.45% <30.00%> (+0.08%)	⬆️
systeroid-tui/src/lib.rs	58.83% <46.16%> (-2.71%)	⬇️
systeroid-tui/src/ui.rs	76.68% <48.65%> (-6.48%)	⬇️
systeroid-core/src/config.rs	98.15% <66.67%> (-1.85%)	⬇️
systeroid-core/src/sysctl/controller.rs	77.23% <77.78%> (-0.89%)	⬇️
systeroid-core/src/sysctl/parameter.rs	90.22% <100.00%> (+0.11%)	⬆️
... and 2 more

... and 1 file with indirect coverage changes

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