feat(http, uploads): add `allow` option

[rustatian]

Reason for This PR

• closes: #123

Description of Changes

• Add the new configuration option to the http.uploads config -> http.uploads.allow. With the new options the user will be able to use only allowed file extensions instead of blacklisting all possible files extensions via the http.uploads.forbid option.
• Default value for the http.uploads.allow is empty. That means, that the allow check will be skipped.
• If http.uploads.allow and http.uploads.forbid contains both the same extension, http.uploads.forbid has higher priority, so, the extension will be forbidden.

Config:

http:
  address: 127.0.0.1:18903
  max_request_size: 1024
  middleware: ["pluginMiddleware", "pluginMiddleware2"]
  uploads:
    forbid: [".php", ".exe", ".bat"]
    allow: [".html", ".aaa" ] <------------- NEW
  trusted_subnets:
    [
      "10.0.0.0/8",
      "127.0.0.0/8",
      "172.16.0.0/12",
      "192.168.0.0/16",
      "::1/128",
      "fc00::/7",
      "fe80::/10",
    ]
  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]

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

[codecov[bot]]

Codecov Report

Merging #134 (d6e8b55) into master (62c5131) will increase coverage by 0.22%. The diff coverage is 94.33%.

@@            Coverage Diff             @@
##           master     #134      +/-   ##
==========================================
+ Coverage   65.10%   65.33%   +0.22%     
==========================================
  Files         138      138              
  Lines       10987    11007      +20     
==========================================
+ Hits         7153     7191      +38     
+ Misses       3109     3094      -15     
+ Partials      725      722       -3     

Impacted Files	Coverage Δ
http/config/uploads_config.go	86.95% <84.21%> (-13.05%)	:arrow_down:
http/handler/handler.go	81.05% <100.00%> (+0.40%)	:arrow_up:
http/handler/parse.go	95.87% <100.00%> (-0.05%)	:arrow_down:
http/handler/request.go	78.48% <100.00%> (ø)
http/handler/uploads.go	80.88% <100.00%> (+7.11%)	:arrow_up:
http/plugin.go	77.30% <100.00%> (+0.32%)	:arrow_up:
tcp/plugin.go	72.17% <0.00%> (+0.86%)	:arrow_up:
redis/pubsub/pubsub.go	72.86% <0.00%> (+2.32%)	:arrow_up:
boltdb/boltjobs/listener.go	64.15% <0.00%> (+2.83%)	:arrow_up:
... and 3 more

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