[otap-dataflow] Add validation process for verifying otlp requests after encoding and decoding

[c1ly]

Add the validation process based on https://github.com/open-telemetry/otel-arrow/blob/main/docs/validation_process.md to verify that otlp requests are equivalent after encoding and decoding.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.83%. Comparing base (1af4d28) to head (a06f9f9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1696      +/-   ##
==========================================
- Coverage   84.08%   81.83%   -2.26%     
==========================================
  Files         467      181     -286     
  Lines      137359    51421   -85938     
==========================================
- Hits       115500    42080   -73420     
+ Misses      21325     8807   -12518     
  Partials      534      534              

Components	Coverage Δ
otap-dataflow	∅ <ø> (∅)
query_abstraction	80.61% <ø> (ø)
query_engine	90.22% <ø> (-0.17%)	⬇️
syslog_cef_receivers	∅ <ø> (∅)
otel-arrow-go	53.50% <ø> (ø)

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[jmacd]

I'm glad to see the use of Weaver to generate synthetic data!