Implement set_target for SendData

[shreyamalpani]

What does this PR do?

Implements set_target to override the endpoint for a SendData.

Motivation

Supporting dual shipping for traces in the Lambda Extension.

Additional Notes

Anything else we should know when reviewing?

How to test the change?

Describe here in detail how the change can be validated.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 71.22%. Comparing base (9a0e324) to head (57fbbcf).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1134      +/-   ##
==========================================
- Coverage   71.45%   71.22%   -0.23%     
==========================================
  Files         342      343       +1     
  Lines       52001    52396     +395     
==========================================
+ Hits        37158    37321     +163     
- Misses      14843    15075     +232     

Components	Coverage Δ
datadog-crashtracker	43.91% <ø> (-0.11%)	⬇️
datadog-crashtracker-ffi	5.93% <ø> (-0.10%)	⬇️
datadog-alloc	98.73% <ø> (ø)
data-pipeline	89.21% <ø> (+<0.01%)	⬆️
data-pipeline-ffi	87.55% <ø> (+0.17%)	⬆️
ddcommon	82.88% <ø> (ø)
ddcommon-ffi	69.66% <ø> (ø)
ddtelemetry	60.08% <ø> (-0.07%)	⬇️
ddtelemetry-ffi	21.32% <ø> (ø)
dogstatsd-client	83.26% <ø> (ø)
datadog-ipc	82.58% <ø> (ø)
datadog-profiling	77.13% <ø> (ø)
datadog-profiling-ffi	62.12% <ø> (ø)
datadog-sidecar	40.28% <ø> (-0.91%)	⬇️
datdog-sidecar-ffi	5.17% <ø> (+2.38%)	⬆️
spawn-worker	55.35% <ø> (ø)
tinybytes	90.96% <ø> (ø)
datadog-trace-normalization	98.24% <ø> (ø)
datadog-trace-obfuscation	94.17% <ø> (ø)
datadog-trace-protobuf	77.10% <ø> (ø)
datadog-trace-utils	89.04% <0.00%> (-0.19%)	⬇️
datadog-tracer-flare	78.54% <ø> (ø)
datadog-log	76.31% <ø> (ø)

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