refactor entity setup

Make it a bit easier to add different kinds of entities, and
generate entities for the various on_off and toggles reported
from the platform API.

Note however that the platform API doesn't return any useful
state for anything other than the light color and power state
at the time of writing, so this is a bit meh.

Author: wez

src/platform_api.rs

@@ -281,22 +281,31 @@ impl GoveeApiClient {
         anyhow::bail!("Scene '{scene}' is not available for this device");
     }
 
-    pub async fn set_power_state(
+    pub async fn set_toggle_state(
         &self,
         device: &HttpDeviceInfo,
+        instance: &str,
         on: bool,
     ) -> anyhow::Result<ControlDeviceResponseCapability> {
         let cap = device
-            .capability_by_instance("powerSwitch")
-            .ok_or_else(|| anyhow::anyhow!("device has no powerSwitch"))?;
+            .capability_by_instance(instance)
+            .ok_or_else(|| anyhow::anyhow!("device has no {instance}"))?;
 
         let value = cap
             .enum_parameter_by_name(if on { "on" } else { "off" })
-            .ok_or_else(|| anyhow::anyhow!("powerSwitch has no on/off!?"))?;
+            .ok_or_else(|| anyhow::anyhow!("{instance} has no on/off!?"))?;
 
         self.control_device(&device, &cap, value).await
     }
 
+    pub async fn set_power_state(
+        &self,
+        device: &HttpDeviceInfo,
+        on: bool,
+    ) -> anyhow::Result<ControlDeviceResponseCapability> {
+        self.set_toggle_state(device, "powerSwitch", on).await
+    }
+
     pub async fn set_brightness(
         &self,
         device: &HttpDeviceInfo,
@@ -511,7 +520,7 @@ impl HttpDeviceInfo {
     }
 }
 
-#[derive(Deserialize, Serialize, Debug, Default, Clone, Copy)]
+#[derive(Deserialize, Serialize, Debug, Default, Clone, Copy, PartialEq, Eq)]
 pub enum DeviceType {
     #[serde(rename = "devices.types.light")]
     #[default]
@@ -538,7 +547,7 @@ pub enum DeviceType {
     Other,
 }
 
-#[derive(Deserialize, Serialize, Debug, Clone, Copy)]
+#[derive(Deserialize, Serialize, Debug, Clone, Copy, PartialEq, Eq)]
 pub enum DeviceCapabilityKind {
     #[serde(rename = "devices.capabilities.on_off")]
     OnOff,