Add preliminary timeline support

[sanchda]

Checklist

• [ ] Change(s) are motivated and described in the PR description
• [ ] Testing strategy is described if automated tests are not included in the PR
• [ ] Risks are described (performance impact, potential for breakage, maintainability)
• [ ] Change is maintainable (easy to change, telemetry, documentation)
• [ ] Library release note guidelines are followed or label changelog/no-changelog is set
• [ ] Documentation is included (in-code, generated user docs, public corp docs)
• [ ] Backport labels are set (if applicable)
• [ ] If this PR changes the public interface, I've notified @DataDog/apm-tees.
• [ ] If change touches code that signs or publishes builds or packages, or handles credentials of any kind, I've requested a review from @DataDog/security-design-and-guidance.

Reviewer Checklist

• [ ] Title is accurate
• [ ] All changes are related to the pull request's stated goal
• [ ] Description motivates each change
• [ ] Avoids breaking API changes
• [ ] Testing strategy adequately addresses listed risks
• [ ] Change is maintainable (easy to change, telemetry, documentation)
• [ ] Release note makes sense to a user of the library
• [ ] Author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
• [ ] Backport labels are set in a manner that is consistent with the release branch maintenance policy

[datadog-dd-trace-py-rkomorn[bot]]

Datadog Report

Branch report: sanchda/add_timeline_ddup Commit report: 8454ede Test service: dd-trace-py

:white_check_mark: 0 Failed, 199 Passed, 857 Skipped, 11m 49.19s Total duration (1h 11m 6.28s time saved)

[pr-commenter[bot]]

Benchmarks

Benchmark execution time: 2024-03-14 17:09:16

Comparing candidate commit 39268c2d12360807414e5335a25a6bb68fa669ea in PR branch sanchda/add_timeline_ddup with baseline commit e99c499b3dae162afe8d5d008c184f51f21e1398 in branch main.

Found 2 performance improvements and 2 performance regressions! Performance is the same for 149 metrics, 9 unstable metrics.

scenario:flasksimple-appsec-get

• 🟩 execution_time [-284.454µs; -236.791µs] or [-4.341%; -3.614%]

scenario:flasksimple-tracer

• 🟥 execution_time [+278.115µs; +318.962µs] or [+4.421%; +5.070%]

scenario:httppropagationextract-datadog_tracecontext_tracestate_not_propagated_on_trace_id_no_match

• 🟥 max_rss_usage [+663.185KB; +738.875KB] or [+3.132%; +3.489%]

scenario:samplingrules-low_match

• 🟩 max_rss_usage [-798.088KB; -575.711KB] or [-2.825%; -2.038%]

[sanchda]

Closing as stale. Will reopen