ConfluentKafkaInstrumentor's ProxiedConsumer does not support commit

[jeehun-pas]

Describe your environment
Python 3.8
confluent-kafka[avro]==1.9.2
opentelemetry-instrumentation-confluent-kafka==0.35b0

Steps to reproduce
Call ProxiedConsumer.commit

What is the expected behavior?
Message is committed in Kafka cluster

What is the actual behavior?
Get an exception with message "Consumer closed"

Additional context
ProxiedConsumer is not an actual Consumer but using a private internal Consumer instance to do poll, consume, etc. It is missing an over-ridden version of ProxiedConsumer.commit which calls the private Consumer's commit.

[alolita]

@srikanthccv @lzchen can you please assign @mrajashree to this issue :-) She's working on a PR for this. Thanks!

[srikanthccv]

Can you ask them to leave a comment? Username doesn't show up in the assignees dropdown otherwise.

[mrajashree]

Thanks @alolita @srikanthccv for assigning me this issue (hope my username will now show up :-) )