test(live): add live_test_explanations for real API-based explainer run with Groq and OpenAI models

Author: DYung26

test/live/live_test_explanations.py

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+from plotsense.explanations.explanations import explainer
+from matplotlib import pyplot as plt
+
+# Example: generate a simple plot
+fig, ax = plt.subplots()
+ax.plot([1, 2, 3], [4, 5, 6])
+
+# Replace with your actual API keys
+api_keys = {
+    "groq": "gsk_xyz",
+    "openai": "sk-proj-xyz-abc"
+}
+
+# Run explainer
+result = explainer(
+    fig,
+    prompt="Explain this simple line plot",
+    api_keys=api_keys,
+    selected_models=[("openai", "gpt-4.1")],
+)
+print(result)
+