feat(trace_utils): Allow sending trace stats using custom HTTP client

[lym953]

What does this PR do?

Expose a function that allows sending trace stats using a custom HTTP client object.

Motivation

Required by serverless to use proxy.

Additional Notes

GitHub issue: DataDog/datadog-lambda-extension#860
Jira: https://datadoghq.atlassian.net/browse/SLES-2499

How to test the change?

See DataDog/datadog-lambda-extension#927

[dd-octo-sts]

Artifact Size Benchmark Report

aarch64-alpine-linux-musl

Artifact	Baseline	Commit	Change
/aarch64-alpine-linux-musl/lib/libdatadog_profiling.so	7.57 MB	7.57 MB	0% (0 B) 👌
/aarch64-alpine-linux-musl/lib/libdatadog_profiling.a	83.33 MB	83.33 MB	0% (0 B) 👌

aarch64-unknown-linux-gnu

Artifact	Baseline	Commit	Change
/aarch64-unknown-linux-gnu/lib/libdatadog_profiling.a	96.65 MB	96.65 MB	0% (0 B) 👌
/aarch64-unknown-linux-gnu/lib/libdatadog_profiling.so	9.63 MB	9.63 MB	0% (0 B) 👌

libdatadog-x64-windows

Artifact	Baseline	Commit	Change
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.dll	19.16 MB	19.16 MB	0% (0 B) 👌
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.lib	65.49 KB	65.49 KB	0% (0 B) 👌
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.pdb	132.59 MB	132.58 MB	--.01% (-16.00 KB) 💪
/libdatadog-x64-windows/debug/static/datadog_profiling_ffi.lib	702.84 MB	702.84 MB	0% (0 B) 👌
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.dll	6.38 MB	6.38 MB	0% (0 B) 👌
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.lib	65.49 KB	65.49 KB	0% (0 B) 👌
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.pdb	19.16 MB	19.16 MB	0% (0 B) 👌
/libdatadog-x64-windows/release/static/datadog_profiling_ffi.lib	37.10 MB	37.10 MB	0% (0 B) 👌

libdatadog-x86-windows

Artifact	Baseline	Commit	Change
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.dll	16.24 MB	16.24 MB	0% (0 B) 👌
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.lib	66.50 KB	66.50 KB	0% (0 B) 👌
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.pdb	134.85 MB	134.85 MB	0% (0 B) 👌
/libdatadog-x86-windows/debug/static/datadog_profiling_ffi.lib	690.84 MB	690.84 MB	0% (0 B) 👌
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.dll	4.89 MB	4.89 MB	0% (0 B) 👌
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.lib	66.50 KB	66.50 KB	0% (0 B) 👌
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.pdb	20.33 MB	20.33 MB	0% (0 B) 👌
/libdatadog-x86-windows/release/static/datadog_profiling_ffi.lib	34.82 MB	34.82 MB	0% (0 B) 👌

x86_64-alpine-linux-musl

Artifact	Baseline	Commit	Change
/x86_64-alpine-linux-musl/lib/libdatadog_profiling.a	72.24 MB	72.24 MB	0% (0 B) 👌
/x86_64-alpine-linux-musl/lib/libdatadog_profiling.so	8.96 MB	8.96 MB	0% (0 B) 👌

x86_64-unknown-linux-gnu

Artifact	Baseline	Commit	Change
/x86_64-unknown-linux-gnu/lib/libdatadog_profiling.a	91.34 MB	91.34 MB	0% (0 B) 👌
/x86_64-unknown-linux-gnu/lib/libdatadog_profiling.so	10.32 MB	10.32 MB	0% (0 B) 👌

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.82%. Comparing base (422fae9) to head (128be24).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1345      +/-   ##
==========================================
- Coverage   70.82%   70.82%   -0.01%     
==========================================
  Files         380      380              
  Lines       61025    61039      +14     
==========================================
+ Hits        43224    43229       +5     
- Misses      17801    17810       +9     

Components	Coverage Δ
datadog-crashtracker	∅ <ø> (∅)
datadog-crashtracker-ffi	∅ <ø> (∅)
datadog-alloc	∅ <ø> (∅)
data-pipeline	∅ <ø> (∅)
data-pipeline-ffi	∅ <ø> (∅)
ddcommon	∅ <ø> (∅)
ddcommon-ffi	∅ <ø> (∅)
ddtelemetry	∅ <ø> (∅)
ddtelemetry-ffi	∅ <ø> (∅)
dogstatsd-client	∅ <ø> (∅)
datadog-ipc	82.59% <ø> (ø)
datadog-profiling	0.00% <ø> (ø)
datadog-profiling-ffi	∅ <ø> (∅)
datadog-sidecar	35.93% <ø> (ø)
datdog-sidecar-ffi	11.07% <ø> (ø)
spawn-worker	55.18% <ø> (ø)
tinybytes	∅ <ø> (∅)
datadog-trace-normalization	∅ <ø> (∅)
datadog-trace-obfuscation	94.17% <ø> (ø)
datadog-trace-protobuf	∅ <ø> (∅)
datadog-trace-utils	∅ <ø> (∅)
datadog-tracer-flare	61.06% <ø> (ø)
datadog-log	∅ <ø> (∅)

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