Add Ollama conversation agent (#113962)

* Add ollama conversation agent

* Change iot class

* Much better default template

* Slight adjustment to prompt

* Make casing consistent

* Switch to ollama Python fork

* Add prompt to tests

* Rename to "ollama"

* Download models in config flow

* Update homeassistant/components/ollama/config_flow.py

---------

Co-authored-by: Paulus Schoutsen <balloob@gmail.com>

tests/components/ollama/conftest.py

@@ -0,0 +1,37 @@
+"""Tests Ollama integration."""
+
+from unittest.mock import patch
+
+import pytest
+
+from homeassistant.components import ollama
+from homeassistant.core import HomeAssistant
+from homeassistant.setup import async_setup_component
+
+from . import TEST_OPTIONS, TEST_USER_DATA
+
+from tests.common import MockConfigEntry
+
+
+@pytest.fixture
+def mock_config_entry(hass: HomeAssistant) -> MockConfigEntry:
+    """Mock a config entry."""
+    entry = MockConfigEntry(
+        domain=ollama.DOMAIN,
+        data=TEST_USER_DATA,
+        options=TEST_OPTIONS,
+    )
+    entry.add_to_hass(hass)
+    return entry
+
+
+@pytest.fixture
+async def mock_init_component(hass: HomeAssistant, mock_config_entry: MockConfigEntry):
+    """Initialize integration."""
+    assert await async_setup_component(hass, "homeassistant", {})
+
+    with patch(
+        "ollama.AsyncClient.list",
+    ):
+        assert await async_setup_component(hass, ollama.DOMAIN, {})
+        await hass.async_block_till_done()