feat(informer): Update informer statistic

[rustatian]

Reason for This PR

closes https://github.com/spiral/roadrunner/issues/639 closes https://github.com/spiral/roadrunner/issues/633 fixes #41

Description of Changes

• Update the informer interface to use process statistic
• Make .env usage explicit, w/o defaulting to the .env file in the root
• Update tests

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 #43 (67357f1) into master (c3e1ece) will decrease coverage by 1.37%. The diff coverage is 12.50%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
- Coverage   52.20%   50.83%   -1.38%     
==========================================
  Files          11       11              
  Lines         295      301       +6     
==========================================
- Hits          154      153       -1     
- Misses        131      137       +6     
- Partials       10       11       +1     

Impacted Files	Coverage Δ
internal/cli/workers/command.go	24.56% <0.00%> (-2.37%)	:arrow_down:
internal/container/plugins.go	100.00% <100.00%> (ø)
internal/cli/root.go	70.83% <0.00%> (-4.17%)	:arrow_down:

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