Add diagnostics for SamsungTV (#65342)

.coveragerc

@@ -947,6 +947,7 @@ omit =
     homeassistant/components/sabnzbd/*
     homeassistant/components/saj/sensor.py
     homeassistant/components/samsungtv/bridge.py
+    homeassistant/components/samsungtv/diagnostics.py
     homeassistant/components/satel_integra/*
     homeassistant/components/schluter/*
     homeassistant/components/scrape/sensor.py

homeassistant/components/samsungtv/diagnostics.py

@@ -0,0 +1,18 @@
+"""Diagnostics support for SamsungTV."""
+from __future__ import annotations
+
+from homeassistant.components.diagnostics import async_redact_data
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import CONF_TOKEN
+from homeassistant.core import HomeAssistant
+
+TO_REDACT = {CONF_TOKEN}
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, entry: ConfigEntry
+) -> dict:
+    """Return diagnostics for a config entry."""
+    diag_data = {"entry": async_redact_data(entry.as_dict(), TO_REDACT)}
+
+    return diag_data