[sendspin] Add a group media player controller (PR3) (#15948)

Co-authored-by: Copilot <copilot@github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>
Co-authored-by: J. Nick Koston <nick@koston.org>

tests/components/sendspin/common-media_player.yaml

@@ -0,0 +1,5 @@
+<<: !include common.yaml
+
+media_player:
+  - platform: sendspin
+    id: media_player_id

tests/components/sendspin/test-media_player.esp32-idf.yaml

@@ -0,0 +1 @@
+<<: !include common-media_player.yaml