chore: move sample to expo (#3880)

* perf: ensure we do not provide callback to native if no callback provided from app

* chore: rework bufferConfig to make it more generic and reduce ReactExoplayerView code size

* chore: improve issue template

* fix(android): avoid video view flickering at playback startup

* fix: ensure player doesn't start when view is unmounted

* chore: move basic sample to expo

* Update examples/basic/package.json

Co-authored-by: Krzysztof Moch <krzysmoch.programs@gmail.com>

* chore: use last expo version

* chore: fix podfile

---------

Co-authored-by: Krzysztof Moch <krzysmoch.programs@gmail.com>

examples/basic/.gitignore

@@ -70,3 +70,8 @@ buck-out/
 !.yarn/releases
 !.yarn/sdks
 !.yarn/versions
+
+# Expo
+.expo
+dist/
+web-build/