ARROW-6721: [JAVA] Avro adapter benchmark only runs once in JMH #5524
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Related to ARROW-6721.
The current AvroAdapterBenchmark actually only run once during JMH evaluation, since the decoder was consumed for the first time and the follow-up invokes will directly return.
To solve this, we use BinaryDecoder explicitly in benchmark and reset its inner stream first when the test method is invoked.