lazy load telemetry entrypoint only when needed

[rochdev]

What does this PR do?

Lazy load telemetry entrypoint only when needed.

Motivation

Right now when telemetry is disabled, the code is still loaded which impacts startup time.

Additional Notes

For now I only handled the entrypoint, but there are also modules using the internals directly which will be addressed in another PR.

[github-actions]

Overall package size

Self size: 8.68 MB
Deduped: 94.88 MB
No deduping: 95.4 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | @datadog/libdatadog | 0.4.0 | 29.44 MB | 29.44 MB | | @datadog/native-appsec | 8.4.0 | 19.25 MB | 19.26 MB | | @datadog/native-iast-taint-tracking | 3.3.0 | 13.77 MB | 13.78 MB | | @datadog/pprof | 5.5.1 | 9.79 MB | 10.17 MB | | protobufjs | 7.2.5 | 2.77 MB | 5.16 MB | | @datadog/native-iast-rewriter | 2.8.0 | 2.6 MB | 2.74 MB | | @opentelemetry/core | 1.14.0 | 872.87 kB | 1.47 MB | | @datadog/native-metrics | 3.1.0 | 1.06 MB | 1.46 MB | | @opentelemetry/api | 1.8.0 | 1.21 MB | 1.21 MB | | import-in-the-middle | 1.11.2 | 112.74 kB | 835.4 kB | | source-map | 0.7.4 | 226 kB | 226 kB | | opentracing | 0.14.7 | 194.81 kB | 194.81 kB | | lru-cache | 7.18.3 | 133.92 kB | 133.92 kB | | pprof-format | 2.1.0 | 111.69 kB | 111.69 kB | | @datadog/sketches-js | 2.1.0 | 109.9 kB | 109.9 kB | | lodash.sortby | 4.7.0 | 75.76 kB | 75.76 kB | | ignore | 5.3.2 | 53.63 kB | 53.63 kB | | shell-quote | 1.8.1 | 44.96 kB | 44.96 kB | | istanbul-lib-coverage | 3.2.0 | 29.34 kB | 29.34 kB | | rfdc | 1.3.1 | 25.21 kB | 25.21 kB | | @isaacs/ttlcache | 1.4.1 | 25.2 kB | 25.2 kB | | tlhunter-sorted-set | 0.1.0 | 24.94 kB | 24.94 kB | | limiter | 1.1.5 | 23.17 kB | 23.17 kB | | dc-polyfill | 0.1.4 | 23.1 kB | 23.1 kB | | retry | 0.13.1 | 18.85 kB | 18.85 kB | | semifies | 1.0.0 | 15.84 kB | 15.84 kB | | jest-docblock | 29.7.0 | 8.99 kB | 12.76 kB | | crypto-randomuuid | 1.0.0 | 11.18 kB | 11.18 kB | | ttl-set | 1.0.0 | 4.61 kB | 9.69 kB | | path-to-regexp | 0.1.12 | 6.6 kB | 6.6 kB | | koalas | 1.0.2 | 6.47 kB | 6.47 kB | | module-details-from-path | 1.0.3 | 4.47 kB | 4.47 kB |

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

[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 12 lines in your changes missing coverage. Please review.

Project coverage is 83.13%. Comparing base (6b97186) to head (7cf2992).

Files with missing lines	Patch %	Lines
packages/dd-trace/src/telemetry/telemetry.js	92.77%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5258      +/-   ##
==========================================
+ Coverage   81.29%   83.13%   +1.84%     
==========================================
  Files         481      475       -6     
  Lines       21598    20758     -840     
==========================================
- Hits        17558    17258     -300     
+ Misses       4040     3500     -540     

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[datadog-datadog-prod-us1]

Datadog Report

Branch report: lazy-telemetry-root
Commit report: ab9a7e0
Test service: dd-trace-js-integration-tests

✅ 0 Failed, 630 Passed, 0 Skipped, 16m 9.49s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-02-13 22:22:41

Comparing candidate commit 7cf2992 in PR branch lazy-telemetry-root with baseline commit 6b97186 in branch master.

Found 0 performance improvements and 2 performance regressions! Performance is the same for 910 metrics, 21 unstable metrics.

scenario:plugin-graphql-with-async-hooks-18

• 🟥 execution_time [+243.893ms; +288.400ms] or [+5.028%; +5.945%]
• 🟥 max_rss_usage [+83.588MB; +93.012MB] or [+15.771%; +17.549%]