[part 4] fix(telemetry): report logs

[dmehala]

Description

Fix telemetry logs and add support for stacktrace reporting.

Changes:

• Add unit tests.
• Report stack_trace and timestamp.

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-04-03 10:18:20

Comparing candidate commit c9e8d1b in PR branch dmehala/telemetry/part-4-logs with baseline commit c6ca2f0 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 1 metrics, 0 unstable metrics.

[dubloom]

Hello there, I will review the 3 PRs on telemetry tomorrow morning !

[dubloom]

LGTM, I made suggestion mainly about having one function with optional stacktrace everywhere but I'm still good if you don't want to do that.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 70.58824% with 10 lines in your changes missing coverage. Please review.

Project coverage is 90.81%. Comparing base (c6ca2f0) to head (c9e8d1b).

Files with missing lines	Patch %	Lines
src/datadog/telemetry/telemetry.cpp	0.00%	8 Missing ⚠️
src/datadog/telemetry/log.h	85.71%	1 Missing ⚠️
src/datadog/tracer_telemetry.cpp	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #199      +/-   ##
==========================================
+ Coverage   90.30%   90.81%   +0.51%     
==========================================
  Files          80       81       +1     
  Lines        4621     4651      +30     
==========================================
+ Hits         4173     4224      +51     
+ Misses        448      427      -21     

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