test(trace): add unit test suite for span attribute key naming and primitive value validation

[gcoinstash-cmd]

Summary

Adds standalone unit tests verifying OpenTelemetry span attribute key string formatting:

• Validates alphanumeric character hierarchy separated by dots.
• Asserts attribute value type acceptance for primitive types (str, int, float, bool).

[linux-foundation-easycla]

• ✅ login: herin049 / name: Lukas Hering (36a1ccf)
• ❌ - login: @gcoinstash-cmd / name: gcoinstash-cmd. The commit (3f90b11) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please visit our EasyCLA portal and chat with our support bot.

[opentelemetry-pr-dashboard]

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Waiting on the author · refreshed 2026-09-14 01:09 UTC

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[herin049]

I don't understand the purpose of this PR, it's not testing any behavior in the API/SDK.