feat(metrics): Trace-connected Metrics (Samples)

[Flash0ver]

based on

• feat(metrics): Trace-connected Metrics (Implementation) #4834

Add a sample for the usage of Metrics,
containing both the SDK-Metrics-APIs and the BeforeSendMetric-Option.

#skip-changelog

[github-actions]

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Generated by 🚫 dangerJS against 3cd84c1

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.59%. Comparing base (d730432) to head (3cd84c1).

Additional details and impacted files

@@                       Coverage Diff                        @@
##           feat/trace-connected-metrics    #4841      +/-   ##
================================================================
+ Coverage                         72.58%   72.59%   +0.01%     
================================================================
  Files                               495      495              
  Lines                             17893    17893              
  Branches                           3523     3523              
================================================================
+ Hits                              12988    12990       +2     
+ Misses                             4048     4047       -1     
+ Partials                            857      856       -1     

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