Implement the finish() method and action. implement the is_stopped condition (#7255)

tests/components/speaker/test.esp32-ard.yaml

@@ -1,8 +1,15 @@
 esphome:
   on_boot:
     then:
-      - speaker.play: [0, 1, 2, 3]
-      - speaker.stop
+      - if:
+          condition: speaker.is_stopped
+          then:
+            - speaker.play: [0, 1, 2, 3]
+      - if:
+          condition: speaker.is_playing
+          then:
+            - speaker.finish:
+      - speaker.stop:
 
 i2s_audio:
   i2s_lrclk_pin: 16

tests/components/speaker/test.esp32-c3-ard.yaml

@@ -1,8 +1,15 @@
 esphome:
   on_boot:
     then:
-      - speaker.play: [0, 1, 2, 3]
-      - speaker.stop
+      - if:
+          condition: speaker.is_stopped
+          then:
+            - speaker.play: [0, 1, 2, 3]
+      - if:
+          condition: speaker.is_playing
+          then:
+            - speaker.finish:
+      - speaker.stop:
 
 i2s_audio:
   i2s_lrclk_pin: 6

tests/components/speaker/test.esp32-c3-idf.yaml

@@ -1,8 +1,15 @@
 esphome:
   on_boot:
     then:
-      - speaker.play: [0, 1, 2, 3]
-      - speaker.stop
+      - if:
+          condition: speaker.is_stopped
+          then:
+            - speaker.play: [0, 1, 2, 3]
+      - if:
+          condition: speaker.is_playing
+          then:
+            - speaker.finish:
+      - speaker.stop:
 
 i2s_audio:
   i2s_lrclk_pin: 6

tests/components/speaker/test.esp32-idf.yaml

@@ -1,8 +1,15 @@
 esphome:
   on_boot:
     then:
-      - speaker.play: [0, 1, 2, 3]
-      - speaker.stop
+      - if:
+          condition: speaker.is_stopped
+          then:
+            - speaker.play: [0, 1, 2, 3]
+      - if:
+          condition: speaker.is_playing
+          then:
+            - speaker.finish:
+      - speaker.stop:
 
 i2s_audio:
   i2s_lrclk_pin: 16