DynamoDB: return ConsumedCapacity on delete_item

[rick-soptim]

Extends the changes from #4241 to the DDB DeleteItem endpoint.

DeleteItem-Responses should include an ConsumedCapacity element in the same way as Scan-, Query-, GetItem- and PutItem-Responses already do: https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_DeleteItem.html#DDB-DeleteItem-response-ConsumedCapacity

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.63%. Comparing base (16abebb) to head (2b6545e).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8530   +/-   ##
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  Coverage   92.63%   92.63%           
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  Files        1229     1229           
  Lines      106394   106395    +1     
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+ Hits        98553    98554    +1     
  Misses       7841     7841           

Flag	Coverage Δ
servertests	27.91% <100.00%> (+<0.01%)	⬆️
unittests	92.60% <100.00%> (+<0.01%)	⬆️

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[bblommers]

Makes sense! Thank you for fixing this @rick-soptim