Added performance test project and lots of improvements (#82) · masesgroup/KEFCore@cf661ae

'IKafkaTable.EntityType' hides inherited member 'IEntityTypeProducer.EntityType'. Use the new keyword if hiding was intended.

Possible null reference return.

Converting null literal or possible null value to non-nullable type.

Possible null reference assignment.

Non-nullable field '_streamData' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Possible null reference return.

Possible null reference argument for parameter 'item' in 'void List<Future<RecordMetadata>>.Add(Future<RecordMetadata> item)'.

Possible null reference assignment.

Non-nullable field '_enumerator' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Converting null literal or possible null value to non-nullable type.

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