[New_Features] Adds recently added Assistant cost saving parameters

[qhenkart]

.Describe the change
OpenAI quietly released a major upgrade of their Assistant's API which gives us vital cost management functionality with easy to use parameters

Provide OpenAI documentation link
(https://platform.openai.com/docs/api-reference/runs)

Describe your solution
Not much to mention, it simply adds the new parameters to the object

Tests
as these are just extra fields in the request and response object, it cannot really be tested with unit tests

Additional context
I purposely skipped some of the other new fields such as
Stream, which requires more infrastructure and should be it's own PR to define a properly abstracted streaming solution
I also skipped tool_choice and response_format, both because the documentation is not clear, and would require additional testing.

This PR is focused primarily on the very straight forward cost cutting parameters

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.67%. Comparing base (774fc9d) to head (6b5c472).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #710      +/-   ##
==========================================
+ Coverage   98.46%   98.67%   +0.21%     
==========================================
  Files          24       24              
  Lines        1364     1134     -230     
==========================================
- Hits         1343     1119     -224     
+ Misses         15        9       -6     
  Partials        6        6              

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[sashabaranov]

Looks good! Thank you for the PR!