Refactor Signal Handling to be Cross-Platform

[tyleranton]

This PR introduces the proposed changes from #58

• Removed the dependency on signal_hook.
• Implemented Unix-specific signal handling using tokio::signal::unix.
• Implemented Windows-specific signal handling using tokio::signal::ctrl_c.

closes #58

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.

Project coverage is 32.45%. Comparing base (225f81e) to head (3c4cc70).
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/server/mod.rs	0.00%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
- Coverage   32.59%   32.45%   -0.15%     
==========================================
  Files          28       28              
  Lines        2227     2237      +10     
==========================================
  Hits          726      726              
- Misses       1501     1511      +10     

Flag	Coverage Δ
unittests	32.45% <0.00%> (-0.15%)	⬇️

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[jessfraz]

thank you!