Add cost control via the new max_prompt_tokens parameter

[codingjoe]

See also: https://platform.openai.com/docs/assistants/how-it-works/max-completion-and-max-prompt-tokens

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 57.06%. Comparing base (b071bfb) to head (76951cb).
Report is 2 commits behind head on main.

Files	Patch %	Lines
sam/utils.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #48      +/-   ##
==========================================
+ Coverage   54.15%   57.06%   +2.90%     
==========================================
  Files           9       10       +1     
  Lines         325      354      +29     
==========================================
+ Hits          176      202      +26     
- Misses        149      152       +3     

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[amureki]

Nice!