Make log4j2 integration compatible with log4j 3.0

[lbloder]

📜 Description

Bump log4j2 version to 2.20.0
Use AnnotationProcessor instead of package scanning to find Plugin.

💡 Motivation and Context

Fixes #2616

💚 How did you test it?

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

[github-actions]

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

Generated by 🚫 dangerJS against df15aba

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (de453e7) 81.39% compared to head (df15aba) 81.39%.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #2634   +/-   ##
=========================================
  Coverage     81.39%   81.39%           
  Complexity     4231     4231           
=========================================
  Files           337      337           
  Lines         15622    15622           
  Branches       2041     2041           
=========================================
  Hits          12715    12715           
  Misses         2112     2112           
  Partials        795      795           

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[adinauer]

LGTM