Deprecate loop argument to AIOKafkaConsumer/AIOKafkaProducer

[ods]

Changes

Related to issue #689 and MR #694

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> (e.g. 588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the PR
  • ensure type is one of the following:
    • .feature: Signifying a new feature.
    • .bugfix: Signifying a bug fix.
    • .doc: Signifying a documentation improvement.
    • .removal: Signifying a deprecation or removal of public API.
    • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: Fix issue with non-ascii contents in doctest text files.

[codecov]

Codecov Report

Merging #699 (db070f5) into master (306ae6e) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #699   +/-   ##
=======================================
  Coverage   98.00%   98.00%           
=======================================
  Files          29       29           
  Lines        5207     5209    +2     
=======================================
+ Hits         5103     5105    +2     
  Misses        104      104           

Flag	Coverage Δ
cext	87.71% <100.00%> (+<0.01%)	⬆️
integration	97.96% <100.00%> (+<0.01%)	⬆️
purepy	97.48% <100.00%> (-0.04%)	⬇️
unit	51.50% <0.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
aiokafka/consumer/consumer.py	97.91% <100.00%> (+<0.01%)	⬆️
aiokafka/producer/producer.py	98.50% <100.00%> (+<0.01%)	⬆️

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[tvoinarovskyi]

lgtm