Add support for file actions during a config apply

[dhurley]

Proposed changes

With the addition of file actions, we can now support partial updates to NGINX configuration. Before all NGINX config files needed to be sent to perform a config apply. Now you only need to send the files that you have made updates to.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

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[codecov-commenter]

Codecov Report

Patch coverage: 51.44% and project coverage change: -0.32% ⚠️

Comparison is base (131ae14) 67.05% compared to head (e3df68a) 66.74%.
Report is 1 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #464      +/-   ##
==========================================
- Coverage   67.05%   66.74%   -0.32%     
==========================================
  Files         113      113              
  Lines       12931    13020      +89     
==========================================
+ Hits         8671     8690      +19     
- Misses       3687     3754      +67     
- Partials      573      576       +3     

Files Changed	Coverage Δ
src/core/nginx.go	44.33% <49.47%> (-0.29%)	⬇️
src/core/environment.go	52.36% <55.81%> (+0.33%)	⬆️

... and 2 files with indirect coverage changes

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