Rename SensorState to SensorStateSnapshot

The state message in this case is a snapshot of the sensor's composite
state at a given time. The name `SensorStateSnapshot` is more descriptive
and accurately reflects the purpose of the message.

Signed-off-by: Tiyash Basu <[email protected]>

Author: tiyash-basu-frequenz

RELEASE_NOTES.md

@@ -32,6 +32,7 @@
 - Renamed `ComponentCategoryMetadataVariant` to `ElectricalComponentCategorySpecificInfo`.
 - Renamed field `ElectricalComponent.category_type` to `ElectricalComponent.category_specific_info` to better reflect its purpose.
 - Renamed `ElectricalComponentState` to `ElectricalComponentStateSnapshot` to better reflect its purpose.
+- Renamed `SensorState` to `SensorStateSnapshot` to better reflect its purpose.
 
 ## Bug Fixes
 

proto/frequenz/api/common/v1/microgrid/sensors/sensors.proto

@@ -168,7 +168,7 @@ message SensorDiagnostic {
 }
 
 // Representation of a sensor state and errors.
-message SensorState {
+message SensorStateSnapshot {
   // The time at which the state was sampled.
   google.protobuf.Timestamp sampled_at = 1;
 
@@ -257,6 +257,6 @@ message SensorData {
   repeated SensorMetricSample metric_samples = 2;
 
   // List of states of a specific microgrid sensor.
-  repeated SensorState states = 3;
+  repeated SensorStateSnapshot states = 3;
 }