ENG-4490: Setting default value for query param '_limit'.

[JMkrish]

https://sightmachine.atlassian.net/browse/ENG-4490

The absence of the '_limit' parameter in the query dictionary resulted in a misleading log message indicating that '_limit' was set to 5000. However, in reality the parameter was left unset. Consequently, the limit was automatically set to the maximum possible value like 'np.Inf' before executing the SQL query. This led to Gateway Timeout-504 issues when attempting to fetch cycles from a DB with a large number of records.

If the limit is not set in the dictionary, by programmatically setting it to 5000 resolved the Gateway timeout issues. Enabling smooth execution of the notebook at my end.

However, it needs to be addressed that if the user selects a very large value for '_limit' in the query itself, then the issue may reappear again.

[codecov-commenter]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (c5c65bf) 23.48% compared to head (4d0c3e5) 23.25%.

Files	Patch %	Lines
smsdk/client_v0.py	0.00%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #72      +/-   ##
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- Coverage   23.48%   23.25%   -0.23%     
==========================================
  Files          11       11              
  Lines        1350     1363      +13     
  Branches      315      320       +5     
==========================================
  Hits          317      317              
- Misses       1033     1046      +13     

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