Add test for get_asset method

[Copilot]

The get_asset method was recently added to fetch a single asset using the dedicated /api/v3_0/assets/{asset_id} endpoint, but lacked test coverage.

Changes

• Added test_get_asset to tests/test_client.py following existing test patterns
• Test validates correct endpoint usage, response parsing, and return value

@pytest.mark.asyncio
async def test_get_asset() -> None:
    with aioresponses() as m:
        flexmeasures_client = FlexMeasuresClient(
            email="test@test.test", password="test"
        )
        flexmeasures_client.access_token = "test-token"
        m.get(
            "http://localhost:5000/api/v3_0/assets/3",
            status=200,
            payload={
                "account_id": 2,
                "id": 3,
                "name": "toy-battery",
                # ...
            },
        )

        asset = await flexmeasures_client.get_asset(asset_id=3)
        assert asset["id"] == 3
        assert asset["name"] == "toy-battery"

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