feat(ws): add websocket context propagation

[tlhunter]

What does this PR do?

• adds context propagation for websocket messages sent using the ws package

Motivation

• feature parity with the other tracers
• spec

[github-actions]

Overall package size

Self size: 3.58 MB
Deduped: 4.46 MB
No deduping: 4.46 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | import-in-the-middle | 1.15.0 | 127.66 kB | 856.24 kB | | dc-polyfill | 0.1.10 | 26.73 kB | 26.73 kB |

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}

[codecov]

Codecov Report

❌ Patch coverage is 47.14286% with 37 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.65%. Comparing base (5856d72) to head (fe1120a).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
packages/datadog-plugin-ws/src/close.js	47.61%	11 Missing ⚠️
packages/datadog-plugin-ws/src/util.js	44.44%	10 Missing ⚠️
packages/datadog-plugin-ws/src/producer.js	42.85%	8 Missing ⚠️
packages/datadog-plugin-ws/src/receiver.js	42.85%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7077      +/-   ##
==========================================
- Coverage   84.83%   84.65%   -0.19%     
==========================================
  Files         515      522       +7     
  Lines       22022    22218     +196     
==========================================
+ Hits        18683    18808     +125     
- Misses       3339     3410      +71     

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[pr-commenter]

Benchmarks

Benchmark execution time: 2025-12-12 20:38:00

Comparing candidate commit fe1120a in PR branch tlhunter/websocket-context-propagation with baseline commit 5856d72 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 286 metrics, 34 unstable metrics.

[tlhunter]

This is always falsey