Fix what can be modified via ReadWriteLogRecord

[pellared]

Fixes https://github.com/open-telemetry/opentelemetry-specification/issues/3902

Changes

Fix what can be modified via ReadWriteLogRecord.

[pellared]

I support this change, but how are we going to account for the SIGs that have implemented modification of more than the information added via Emit?

PTAL @open-telemetry/cpp-maintainers

Maybe C++ SIG could deprecate the methods, change its behavior to be no-op (no operation) and update the documentation accordingly?

[github-actions[bot]]

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