fix: ensure poster works as expected and add it to the sample (#3643)

* fix: ensure poster works as expected and add it to the sample
* chore: drop audioOnly property as not implemented on any platform
* fix(ios): do not save pause state before seeking
* fix(ts): onPlaybackRateChangeData was not correctly typed

package.json

@@ -48,6 +48,7 @@
         "test": "echo no test available",
         "check-ios": "scripts/swift-format.sh && scripts/swift-lint.sh && scripts/clang-format.sh",
         "check-android": "scripts/kotlin-lint.sh",
+        "check-all": "yarn check-android; yarn check-ios; yarn lint",
         "codegen": "node ./node_modules/react-native/scripts/generate-codegen-artifacts.js --path ./ ./output"
     },
     "files": [