feat(http, new_relic): add new_relic plugin

[rustatian]

Reason for This PR

• Add [Beta] release for the NewRelic platform

Description of Changes

• Add NewRelic plugin

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 #122 (5b497b0) into master (937ebfa) will increase coverage by 0.10%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #122      +/-   ##
==========================================
+ Coverage   43.49%   43.59%   +0.10%     
==========================================
  Files          12       12              
  Lines         561      562       +1     
==========================================
+ Hits          244      245       +1     
  Misses        306      306              
  Partials       11       11              

Impacted Files	Coverage Δ
internal/container/plugins.go	100.00% <100.00%> (ø)

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