Implement consume for DeserializingConsumer

[charles-cooper]

Factors out the parsing logic from DeserializingConsumer.poll() to reuse
in consume().

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[charles-cooper]

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I don't agree to the terms of this agreement. I am releasing my code as open source code under the Apache 2.0 license, which you can find at https://github.com/charles-cooper/confluent-kafka-python/blob/master/LICENSE.txt. You are free to accept or reject this pull request as you wish.

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Appreciation of efforts,

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[charles-cooper]

Oops, looks like I may have duplicated some work with #1085

[raphaelauv]

@charles-cooper thanks for your contribution, unfortunately things are very slow over here

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Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
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[raphaelauv]

this is still necessary , could we merge this
@akhileshm1 @emasab ?

Thanks

[raphaelauv]

gentle ping @rayokota @pranavrth , thanks

[raphaelauv]

gentle ping @rayokota , thanks