Kafka component, data race when running and initializing multiple kafka components concurrently

[famarting]

Expected Behavior

Kafka component supports to run and initialize multiple instances concurrently

Actual Behavior

I was writing some tests using the kafka component and I'm having a data race when running tests in parallel.

The data race is due to this https://github.com/dapr/components-contrib/blob/main/common/component/kafka/kafka.go#L190

the kafka component is overwriting a global sarama client variable, the data race produces when one component is running and using the sarama log and concurrently another kafka component is initializing.

Steps to Reproduce the Problem

Release Note

RELEASE NOTE: