Capture markers in log4j2 and logback appenders

[anderscarling]

📜 Description

Collect markers from logger system in log4j2 and logback appenders.

💡 Motivation and Context

Adds useful context to logged errors, some more discussion in #1547

💚 How did you test it?

Running test suite for the relevant libraries.

📝 Checklist

• I reviewed the submitted code
• I added tests to verify the changes
• I updated the docs if needed
• No breaking changes

🔮 Next steps

The change should probably be documented on these pages:

• https://docs.sentry.io/platforms/java/guides/logback/usage/advanced-usage/
• https://docs.sentry.io/platforms/java/guides/log4j2/advanced_usage/

Some inspiration could be had from this docs from the legacy sdk:

• https://docs.sentry.io/platforms/java/guides/logback/legacy/logback/

[marandaneto]

@anderscarling thanks for doing this, please add an entry to the changelog

[anderscarling]

@marandaneto Fixed that + the style issue (incorrect import order)

[marandaneto]

@marandaneto Fixed that + the style issue (incorrect import order)

awesome, thank you.

[bruno-garcia]

LGTM. Thanks @anderscarling

[codecov-commenter]

Codecov Report

Merging #1551 (97eb5b8) into main (a5f30b4) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main    #1551      +/-   ##
============================================
+ Coverage     76.00%   76.01%   +0.01%     
- Complexity     1942     1944       +2     
============================================
  Files           192      192              
  Lines          6721     6725       +4     
  Branches        668      670       +2     
============================================
+ Hits           5108     5112       +4     
  Misses         1287     1287              
  Partials        326      326              

Impacted Files	Coverage Δ
...src/main/java/io/sentry/log4j2/SentryAppender.java	85.54% <100.00%> (+0.35%)	⬆️
...rc/main/java/io/sentry/logback/SentryAppender.java	89.02% <100.00%> (+0.27%)	⬆️

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