chore: Metrics disabled environment variable

[hjgraca]

Please provide the issue number

Issue number: #781

Summary

Changes

Add POWERTOOLS_METRICS_DISABLED support to disable Metrics to be emited

User experience

Set POWERTOOLS_METRICS_DISABLED environment variable to true

Checklist

Please leave checklist items unchecked if they do not apply to your change.

• Meets tenets criteria
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.02%. Comparing base (75ee06b) to head (f2e94df).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #786   +/-   ##
========================================
  Coverage    74.02%   74.02%           
========================================
  Files          210      210           
  Lines         8396     8404    +8     
  Branches       907      910    +3     
========================================
+ Hits          6215     6221    +6     
- Misses        1883     1884    +1     
- Partials       298      299    +1     

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