Handle responses that exceed DynamoDB max item size

[JWCook]

Fixes #177

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (0fc4736) 96.32% compared to head (cd3a32b) 96.04%.

❗ Current head cd3a32b differs from pull request most recent head c9f37af. Consider uploading reports for the commit c9f37af to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #194      +/-   ##
==========================================
- Coverage   96.32%   96.04%   -0.28%     
==========================================
  Files          10       10              
  Lines         979      986       +7     
  Branches      181      182       +1     
==========================================
+ Hits          943      947       +4     
- Misses         23       25       +2     
- Partials       13       14       +1     

Files	Coverage Δ
aiohttp_client_cache/backends/dynamodb.py	93.81% <62.50%> (-2.86%)	⬇️

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