docs(otel): document OTLP serialization performance characteristics

[intech]

Summary

• Adds Performance Characteristics section to @connectum/otel README
• Documents OTLP protobuf serializer status per signal (logs/traces/metrics)
• Explains otlp-transformer version pin rationale
• Provides guidance for high-volume span workloads

Context

OTel JS attempted to migrate otlp-transformer to @bufbuild/protobuf in PR #6179 but reverted in PR #6225 due to ~13x serialization slowdown (see issue #6221). Hand-rolled ProtobufLogsSerializer landed in v0.215.0 via PR #6390; traces and metrics migrations are still pending (see #6570).

This doc makes the current state explicit for @connectum/otel consumers.

Test plan

• Markdown renders correctly (biome check passes)
• Links to upstream issues/PRs resolve
• No impact on package code

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Reviewing files that changed from the base of the PR and between 5b3f01d and bcdc880.

📒 Files selected for processing (1)

• packages/otel/README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/otel-otlp-perf-characteristics

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commit: bcdc880