Use the Impl's underlying ObjectPool statistics

[todo]

connectedhomeip/src/inet/InetLayer.h

Lines 79 to 89 in fe681d9

	// TODO: Use the Impl's underlying ObjectPool statistics
	SYSTEM_STATS_INCREMENT(EndPointProperties<EndPointType>::SystemStatsKey);
	return CHIP_NO_ERROR;
	}
	virtual EndPoint * CreateEndPoint() = 0;
	virtual void DeleteEndPoint(EndPoint * endPoint) = 0;
	virtual bool ForEachEndPoint(const EndPointVisitor visitor) = 0;
	private:
	System::Layer * mSystemLayer;

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This issue was generated by todo based on a TODO comment in fe681d9. It's been assigned to @kpschoedel because they committed the code.

[kpschoedel]

Duplicate of #12378