feat: DIA-1270: allow Azure inference

[matt-bernstein]

Pass through azure params needed to LiteLLM, and abstract away common inference params into a Settings class, removing 100 lines of redundant parameter plumbing+docs and ensuring all litellm-derived Runtimes have the same API.

Other QoL improvements

• remove unused splitter arg in runtimes
• simplify pytest marks for server
• big lint

Example of an Azure payload is at the end of test_server.py.

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Commit https://github.com/HumanSignal/infra/commit/8ad0110425bd8d53b7d72e72645b1e80bfac7e4a is created.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 49.18033% with 62 lines in your changes missing coverage. Please review.

Project coverage is 58.49%. Comparing base (41f0270) to head (fba2889). Report is 3 commits behind head on master.

Files	Patch %	Lines
server/handlers/result_handlers.py	3.57%	27 Missing :warning:
adala/runtimes/_litellm.py	25.92%	20 Missing :warning:
adala/utils/pydantic_generator.py	69.23%	8 Missing :warning:
adala/utils/llm.py	82.14%	5 Missing :warning:
adala/runtimes/base.py	33.33%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #169 +/- ## ========================================== - Coverage 61.17% 58.49% -2.69% ========================================== Files 43 43 Lines 1870 1872 +2 ========================================== - Hits 1144 1095 -49 - Misses 726 777 +51 ```

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