Improve NGINX plugin

[JSCU-CNI]

This PR adds several improvements to the NGINX plugin:

1. Add error.log parsing
2. Server hosts parsing
3. JSON access.log parsing
4. Improved server configuration (.conf) parsing

[codecov]

Codecov Report

Attention: Patch coverage is 79.02098% with 30 lines in your changes missing coverage. Please review.

Project coverage is 79.27%. Comparing base (b811c4a) to head (1646c9a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
dissect/target/plugins/apps/webserver/nginx.py	79.02%	30 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #1073    +/-   ##
========================================
  Coverage   79.26%   79.27%            
========================================
  Files         346      346            
  Lines       30689    30793   +104     
========================================
+ Hits        24327    24411    +84     
- Misses       6362     6382    +20     

Flag	Coverage Δ
unittests	79.27% <79.02%> (+<0.01%)	⬆️

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[Schamper]

Small style change