feat(http): access logs and x-sendfile support

[rustatian]

Reason for This PR

closes: #9
closes: #34

Description of Changes

• Add support for the access logs at Info log level.
  Fields:
  method - http method.
  remote_addr - request remote address.
  bytes_sent - content-length,
  http_host - host.
  request - request Query.
  time_local - local time in Common Log Format.
  request_length - request body with headers size (content-len + size of all headers) in bytes. Max allowed headers size for the RR is 1MB.
  request_time - request processing time in seconds with a milliseconds resolution.
  status - http response status.
  http_user_agent - http user agent
  http_referer - http referer

• ✏️ Access logs turned off by default, to turn on, please, use the following field in the configuration:

http:
  address: 127.0.0.1:58332
  max_request_size: 1024
  access_logs: true <----------------- NEW
  middleware: [ ]
  pool:
    num_workers: 2
    max_jobs: 0
    allocate_timeout: 60s
    destroy_timeout: 60s

• ✏️ HTTP middleware to handle Symfony's X-Sendfile header.

http:
  address: 127.0.0.1:44444
  max_request_size: 1024
  middleware: ["sendfile"] <----- NEW MIDDLEWARE

  pool:
    num_workers: 2
    max_jobs: 0
    allocate_timeout: 60s
    destroy_timeout: 60s

License Acceptance

By submitting this pull request, I confirm that my contribution is made under
the terms of the MIT license.

PR Checklist

[Author TODO: Meet these criteria.]
[Reviewer TODO: Verify that these criteria are met. Request changes if not]

• All commits in this PR are signed (git commit -s).
• The reason for this PR is clearly provided (issue no. or explanation).
• The description of changes is clear and encompassing.
• Any required documentation changes (code and docs) are included in this PR.
• Any user-facing changes are mentioned in CHANGELOG.md.
• All added/changed functionality is tested.

[codecov]

Codecov Report

Merging #56 (3d0f439) into master (2c385f7) will increase coverage by 0.22%.
The diff coverage is 91.17%.

❗ Current head 3d0f439 differs from pull request most recent head bfcb6fd. Consider uploading reports for the commit bfcb6fd to get more accurate results

@@            Coverage Diff             @@
##           master      #56      +/-   ##
==========================================
+ Coverage   67.48%   67.71%   +0.22%     
==========================================
  Files         110      110              
  Lines        9233     9294      +61     
==========================================
+ Hits         6231     6293      +62     
  Misses       2376     2376              
+ Partials      626      625       -1     

Impacted Files	Coverage Δ
http/config/http.go	55.23% <ø> (ø)
http/middleware/gzip/plugin.go	88.88% <ø> (ø)
http/middleware/headers/plugin.go	86.48% <ø> (ø)
http/middleware/static/config.go	66.66% <ø> (ø)
http/middleware/static/etag.go	65.90% <ø> (ø)
http/middleware/static/plugin.go	69.90% <ø> (ø)
http/handler/request.go	77.63% <50.00%> (-0.30%)	⬇️
http/ssl.go	36.11% <50.00%> (ø)
http/handler/handler.go	83.40% <90.90%> (+3.72%)	⬆️
http/http.go	45.00% <100.00%> (ø)
... and 6 more

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