Optimize LogEvent to reduce memory consumption

[solnic]

Current status

Git SHA      Branch     Iter     Allocated    Retained     Alloc Mem    Ret Mem     
------------------------------------------------------------------------------------------
213558f3     master     100,000  9,681,713    1,395,346    921.32 MB    217.9 MB    
cafd4cdc     2641-incre 100,000  2,920,177    1,598,060    445.48 MB    285.83 MB   

=== Performance Trends ===

Comparing latest (cafd4cdc) vs baseline (213558f3):

Object Allocation: 📉 -69.84% (decrease)
Object Retention: 📈 +14.53% (increase)
Memory Usage: 📉 -51.65% (decrease)

Memory per iteration:
  Baseline: 9.43 KB
  Latest:   4.56 KB
  Change:   📉 -51.65% (decrease)

=== Recent Commits ===

213558f3 (2025-06-09 12:15)
  [sentry-ruby] fix and improve spec suite setup (#2640)
  Memory: 921.32 MB allocated, 217.9 MB retained

cafd4cdc (2025-06-09 12:15)
  Update CHANGELOG
  Memory: 445.48 MB allocated, 285.83 MB retained

Closes #2641

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.70%. Comparing base (213558f) to head (cafd4cd).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2643      +/-   ##
==========================================
+ Coverage   93.68%   96.70%   +3.01%     
==========================================
  Files         133      133              
  Lines        5101     5131      +30     
==========================================
+ Hits         4779     4962     +183     
+ Misses        322      169     -153     

Components	Coverage Δ
sentry-ruby	97.45% <100.00%> (+4.09%)	⬆️
sentry-rails	92.63% <ø> (-0.79%)	⬇️
sentry-sidekiq	96.19% <ø> (+0.76%)	⬆️
sentry-resque	94.44% <ø> (ø)
sentry-delayed_job	94.68% <ø> (ø)
sentry-opentelemetry	98.62% <ø> (-0.69%)	⬇️

Files with missing lines	Coverage Δ
sentry-ruby/lib/sentry/client.rb	99.40% <100.00%> (ø)
sentry-ruby/lib/sentry/log_event.rb	100.00% <100.00%> (ø)
sentry-ruby/lib/sentry/scope.rb	99.38% <100.00%> (+0.63%)	⬆️

... and 34 files with indirect coverage changes

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[dentarg]

Gotta be careful when using the default value

$ irb
irb(main):001> a = Hash.new("string")
=> {}
irb(main):002> a["foo"]
=> "string"
irb(main):003> a["bar"] << "bar"
=> "stringbar"
irb(main):004> a["foo"]
=> "stringbar"

[sl0thentr0py]

@solnic 🙏

[solnic]

@dentarg @sl0thentr0py I believe we're good since there's frozen string literals magic comment at the top of this file.