[.Net] Add Ollama Support

[mikelor]

Why are these changes needed?

Added support for Ollama. Ollama allows you to run Llama 3, Phi 3, Mistral, Gemma, and other models locally.

This is basic support and utilizes Ollama's OpenAI compatibility. More robust support can be added in a future release. The current model is heavily based on Azure's OpenAI service. I'd be happy to collaborate on a reviewing a future implementation that allows support for more LLM hosting options, and specifics.

Related issue number

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[mikelor]

@microsoft-github-policy-service agree

[gitguardian]

⚠️ GitGuardian has uncovered 96 secrets following the scan of your pull request.

Please consider investigating the findings and remediating the incidents. Failure to do so may lead to compromising the associated services or software components.

Since your pull request originates from a forked repository, GitGuardian is not able to associate the secrets uncovered with secret incidents on your GitGuardian dashboard.
Skipping this check run and merging your pull request will create secret incidents on your GitGuardian dashboard.

🔎 Detected hardcoded secrets in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
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10404693	Triggered	Generic High Entropy Secret	bdb40d7	test/oai/test_utils.py	View secret
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10404695	Triggered	Generic High Entropy Secret	b97b99d	test/oai/test_utils.py	View secret
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10493810	Triggered	Generic Password	97fa339	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
10493810	Triggered	Generic Password	49e8053	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
10493810	Triggered	Generic Password	d422c63	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
10493810	Triggered	Generic Password	97fa339	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
10493810	Triggered	Generic Password	d422c63	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
10493810	Triggered	Generic Password	97fa339	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
10493810	Triggered	Generic Password	501610b	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
10404696	Triggered	Generic High Entropy Secret	954ca45	test/oai/test_utils.py	View secret
10404696	Triggered	Generic High Entropy Secret	bdb40d7	test/oai/test_utils.py	View secret
10404696	Triggered	Generic High Entropy Secret	79dbb7b	test/oai/test_utils.py	View secret
10404696	Triggered	Generic High Entropy Secret	e43a86c	test/oai/test_utils.py	View secret
10422482	Triggered	Generic High Entropy Secret	79dbb7b	test/oai/test_utils.py	View secret
10422482	Triggered	Generic High Entropy Secret	bdb40d7	test/oai/test_utils.py	View secret
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11616921	Triggered	Generic High Entropy Secret	a86d0fd	notebook/agentchat_agentops.ipynb	View secret
11616921	Triggered	Generic High Entropy Secret	394561b	notebook/agentchat_agentops.ipynb	View secret
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12853598	Triggered	Generic High Entropy Secret	2b3a9ae	test/oai/test_utils.py	View secret
12853598	Triggered	Generic High Entropy Secret	c03558f	test/oai/test_utils.py	View secret
10404693	Triggered	Generic High Entropy Secret	c03558f	test/oai/test_utils.py	View secret
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12853599	Triggered	Generic High Entropy Secret	2b3a9ae	test/oai/test_utils.py	View secret
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12853601	Triggered	Generic High Entropy Secret	2b3a9ae	test/oai/test_utils.py	View secret
10493810	Triggered	Generic Password	3b79cc6	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
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10493810	Triggered	Generic Password	11baa52	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
10493810	Triggered	Generic Password	3b79cc6	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
10404696	Triggered	Generic High Entropy Secret	0a3c6c4	test/oai/test_utils.py	View secret
10404696	Triggered	Generic High Entropy Secret	76f5f5a	test/oai/test_utils.py	View secret
10404696	Triggered	Generic High Entropy Secret	c03558f	test/oai/test_utils.py	View secret
10404696	Triggered	Generic High Entropy Secret	2b3a9ae	test/oai/test_utils.py	View secret
10422482	Triggered	Generic High Entropy Secret	2b3a9ae	test/oai/test_utils.py	View secret
10422482	Triggered	Generic High Entropy Secret	c03558f	test/oai/test_utils.py	View secret

and 16 others.

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[jackgerrits]

Looks like ollama support was added in a different PR