Cache dynamodb client and resource in DynamoDB online store implement…

[felixwang9817]

…ation

Signed-off-by: Felix Wang wangfelix98@gmail.com

What this PR does / why we need it: This PR caches the DynamoDB client and resource in the current online store implementation. Previously, the client and resource were reconstructed on each call to the online store, which cost ~80ms.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[achals]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: achals, felixwang9817

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[codecov-commenter]

Codecov Report

Merging #2138 (386d641) into master (192d3ad) will decrease coverage by 0.00%.
The diff coverage is 86.36%.

@@            Coverage Diff             @@
##           master    #2138      +/-   ##
==========================================
- Coverage   83.25%   83.24%   -0.01%     
==========================================
  Files         101      101              
  Lines        8162     8176      +14     
==========================================
+ Hits         6795     6806      +11     
- Misses       1367     1370       +3     

Flag	Coverage Δ
integrationtests	73.41% <86.36%> (-0.32%)	⬇️
unittests	57.88% <27.27%> (-0.04%)	⬇️

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

Impacted Files	Coverage Δ
sdk/python/feast/infra/online_stores/dynamodb.py	81.67% <86.36%> (+1.33%)	⬆️
sdk/python/feast/infra/utils/aws_utils.py	84.05% <0.00%> (-0.73%)	⬇️
.../integration/online_store/test_universal_online.py	97.67% <0.00%> (-0.47%)	⬇️

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