Add valve component (#6447)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

tests/components/template/test.all.yaml

@@ -125,6 +125,23 @@ lock:
     open_action:
       - logger.log: open_action
 
+valve:
+  - platform: template
+    name: "Template Valve"
+    lambda: |-
+      if (id(some_binary_sensor).state) {
+        return VALVE_OPEN;
+      } else {
+        return VALVE_CLOSED;
+      }
+    open_action:
+      - logger.log: open_action
+    close_action:
+      - logger.log: close_action
+    stop_action:
+      - logger.log: stop_action
+    optimistic: true
+
 text:
   - platform: template
     name: "Template text"