logs: Log a warning when an attribute is discarded due to limits

[emdneto]

Before opening a feature request against this repo, consider whether the feature should/could be implemented in the other OpenTelemetry client libraries. If so, please open an issue on opentelemetry-specification first.

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There SHOULD be a message printed in the SDK's log to indicate to the user that an attribute was discarded due to such a limit. To prevent excessive logging, the message MUST be printed at most once per LogRecord (i.e., not per discarded attribute).

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Additional context
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LogRecordLimits

[emdneto]

go implementation: open-telemetry/opentelemetry-go#5376