feat(convo): add new fields to conversation api

[sicoyle]

Description

Python SDK client updates for conversation API new fields for response format, prompt cache, usage metrics, and model return on conversation api. I ran the script to update the proto grpc code generator and added tests for the field additions.

dapr/dapr#9241

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #[issue number]

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[codecov]

Codecov Report

❌ Patch coverage is 97.56098% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 86.58%. Comparing base (bffb749) to head (22d12c8).
⚠️ Report is 65 commits behind head on main.

Files with missing lines	Patch %	Lines
dapr/clients/grpc/client.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #902      +/-   ##
==========================================
- Coverage   86.63%   86.58%   -0.05%     
==========================================
  Files          84      103      +19     
  Lines        4473     6979    +2506     
==========================================
+ Hits         3875     6043    +2168     
- Misses        598      936     +338     

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