add actions to the MAX7219Component (#6462)

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

tests/components/max7219digit/common.yaml

@@ -14,3 +14,15 @@ display:
     id: my_matrix
     lambda: |-
       it.printdigit("hello");
+
+esphome:
+  on_boot:
+    - priority: 100
+      then:
+        - max7129digit.invert_off:
+        - max7129digit.invert_on:
+        - max7129digit.turn_on:
+        - max7129digit.turn_off:
+        - max7129digit.reverse_on:
+        - max7129digit.reverse_off:
+        - max7129digit.intensity: 10