Python : Ollama Connector for Agent Framework (#1104)

* Initial Commit for Olama Connector

* Added Olama Sample

* Add Sample & Fixed Open Telemetry

* Fixed Spelling from Olama to Ollama

* remove"opentelemetry-semantic-conventions-ai ~=0.4.13" since its handled in a different pr

* Added Tool Calling

* Finalizing test cases

* Adjust samples to be more reliable

* Update python/packages/ollama/agent_framework_ollama/_chat_client.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update python/packages/ollama/pyproject.toml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update python/packages/ollama/tests/test_ollama_chat_client.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update python/packages/ollama/agent_framework_ollama/_chat_client.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Improved Docstrings & Sample

* Update python/packages/ollama/agent_framework_ollama/_chat_client.py

Co-authored-by: Eduard van Valkenburg <eavanvalkenburg@users.noreply.github.com>

* Integrate PR Feedback
- Divided Streaming and Non-Streaming into independent Methods
- Catch Ollama Validation Error
- Add OTEL Provider Name
- Checked Ollama Messages
- Add Usage Statistics

* Revert setting, so it can be none

* Validate Message formatting between AF and Ollama

* Catch Ollama Error and raise a ServiceResponse Error

* Fix mypy error

* remove .vscode comma

* Add Reasoning support & adjust to new structure

* Add Ollama Multimodality and Reasoning

* Add test cases for reasoning

* Add Tests for Error Handling in Ollama Client

* Update python/samples/getting_started/multimodal_input/ollama_chat_multimodal.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Integrated Copilot Feedback

* Implement first PR Feedback

* Adjust Readme files for examples

* Adjust argument passing via additional chat options

* Implemented PR Feedback

* Removing Ollama Package from Core and moving samples

* Fix Link & Adding Samples to Main Sample Readme

* Fixing Links in Readme

* Moved Multimodal and Chat Example

* Fixed Link in ChatClient to Ollama

* Fix AgentFramework Links in Ollama Project

* Fix observability breaking change

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Eduard van Valkenburg <eavanvalkenburg@users.noreply.github.com>

python/packages/ollama/tests/conftest.py

@@ -0,0 +1,47 @@
+# Copyright (c) Microsoft. All rights reserved.
+from typing import Any
+
+from agent_framework import ChatMessage
+from pytest import fixture
+
+
+# region: Connector Settings fixtures
+@fixture
+def exclude_list(request: Any) -> list[str]:
+    """Fixture that returns a list of environment variables to exclude."""
+    return request.param if hasattr(request, "param") else []
+
+
+@fixture
+def override_env_param_dict(request: Any) -> dict[str, str]:
+    """Fixture that returns a dict of environment variables to override."""
+    return request.param if hasattr(request, "param") else {}
+
+
+# These two fixtures are used for multiple things, also non-connector tests
+@fixture()
+def ollama_unit_test_env(monkeypatch, exclude_list, override_env_param_dict):  # type: ignore
+    """Fixture to set environment variables for OllamaSettings."""
+
+    if exclude_list is None:
+        exclude_list = []
+
+    if override_env_param_dict is None:
+        override_env_param_dict = {}
+
+    env_vars = {"OLLAMA_HOST": "http://localhost:12345", "OLLAMA_MODEL_ID": "test"}
+
+    env_vars.update(override_env_param_dict)  # type: ignore
+
+    for key, value in env_vars.items():
+        if key in exclude_list:
+            monkeypatch.delenv(key, raising=False)  # type: ignore
+            continue
+        monkeypatch.setenv(key, value)  # type: ignore
+
+    return env_vars
+
+
+@fixture
+def chat_history() -> list[ChatMessage]:
+    return []