profiling: use zstd instead of lz4

[morrisonlevi]

Description

This is a proof-of-concept to see how the libdatadog changes affect a profiling library.

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.13%. Comparing base (3456dec) to head (b3e23b2).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3457      +/-   ##
==========================================
- Coverage   62.15%   62.13%   -0.02%     
==========================================
  Files         141      141              
  Lines       12622    12622              
  Branches     1650     1650              
==========================================
- Hits         7845     7843       -2     
- Misses       4050     4053       +3     
+ Partials      727      726       -1     

see 1 file with indirect coverage changes

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[pr-commenter]

Benchmarks [ profiler ]

Benchmark execution time: 2025-10-18 20:54:04

Comparing candidate commit b3e23b2 in PR branch PROF-11832-Add-zstd-to-compression-configuration-to-libdatadog with baseline commit 3456dec in branch master.

Found 2 performance improvements and 4 performance regressions! Performance is the same for 23 metrics, 7 unstable metrics.

scenario:php-profiler-timeline-memory-with-profiler-and-timeline

• 🟥 cpu_system_time [+109.863ms; +149.609ms] or [+26.801%; +36.498%]
• 🟥 cpu_usage_percentage [+5.019%; +6.524%]
• 🟥 cpu_user_time [+161.635ms; +216.551ms] or [+11.507%; +15.417%]
• 🟥 execution_time [+145.204ms; +157.447ms] or [+12.984%; +14.079%]

scenario:walk_stack/50

• 🟩 wall_time [-736.726ns; -726.570ns] or [-4.566%; -4.503%]

scenario:walk_stack/99

• 🟩 wall_time [-879.736ns; -873.925ns] or [-5.444%; -5.408%]