Precompile server machinery

[jkrumbiegel]

To improve responsiveness of first render using quarto, include a basic server socket connection pass in the precompilation run. Ideally, this would include run but it seems that wasn't desired due to #8

[codecov]

Codecov Report

Attention: Patch coverage is 93.10345% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 85.77%. Comparing base (49e3c3c) to head (d1d6341).
Report is 7 commits behind head on main.

Files	Patch %	Lines
src/precompile.jl	95.65%	1 Missing ⚠️
src/socket.jl	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #55      +/-   ##
==========================================
+ Coverage   85.62%   85.77%   +0.14%     
==========================================
  Files           5        5              
  Lines         473      499      +26     
==========================================
+ Hits          405      428      +23     
- Misses         68       71       +3     

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