[InferenceClient] Renaming extra_parameters to extra_body

[hanouticelina]

Originally suggested by @julien-c here. This way we maintain consistency with OpenAI's python sdk. I took the opportunity to add this argument to chat_completion as well.

[HuggingFaceDocBuilderDev]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.42%. Comparing base (503d353) to head (c80974c).
Report is 60 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2821       +/-   ##
===========================================
+ Coverage   49.47%   82.42%   +32.94%     
===========================================
  Files         106      114        +8     
  Lines       11165    11807      +642     
===========================================
+ Hits         5524     9732     +4208     
+ Misses       5641     2075     -3566     

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[Wauplin]

Thank you!