Flag to return messages received so far when maxWait is reached #313
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The current behavior, to panic on deadline is problematic, since there are a number of scenarios where you simply do not know how many messages there are to consume or when they are produced. For example, a load test may produce messages in bursts with jitter for a burn-in test, to try to provoke i data races in the test subject.
This commit introduces a flag ExpectTimeout which will return message received so far.
The commit also adds a test to verify that we panic if Close() is called while we are consuming. Given the nature of the problem xk6-kafka is trying to solve, this sounds like an error condition.
Fixes #311.