Logging stability review: [minor] LogRecord attribute limits not configurable via `LoggerProvider`

[lmolkova]

Spec: Logs SDK § LogRecord Limits

If the SDK implements attribute limits it MUST provide a way to change these limits, via a configuration to the LoggerProvider [...]

• Required (MUST): if attribute limits are implemented, expose a way to change them via configuration to the LoggerProvider.
• Current: LogRecordLimits (max_attributes, max_attribute_length) is implemented and enforced, but only configurable through env vars (OTEL_ATTRIBUTE_COUNT_LIMIT, OTEL_ATTRIBUTE_VALUE_LENGTH_LIMIT) or defaults. LoggerProvider.__init__ has no limits/log_record_limits parameter.
• Missing: programmatic configuration on LoggerProvider, unlike TracerProvider(span_limits=...). Cross-signal inconsistency.

Part of open-telemetry/community#1751

[lmolkova]

Related PR: #5300