Update to Expo 50

[joshsmith]

This PR updates the demo app to Expo 50, which also required updating the iOS deployment target to 13.4. I've also added in the expo-build-properties that was being added on another branch.

[kobiebotha]

Thanks for this and thanks for the other minor fixes in here!

We don't really need expo-build-properties at that stage, since it only does half of what we need on Android, the flipper plugin also needs to be disabled on android as per docs
). When we switch the protocol from streams to websockets this will all go away, but it's needed for now.

In other more important news, this branch doesn't run on Android - the app crashes on launch. Logcat showing an internal react native type error, so we'll need to fix that before merging.

2-06 11:02:09.793 11420 11420 V SoLoader: libjscexecutor.so not found on /data/app/~~YNwv-FhK51L6KHXdxruLGA==/com.anonymous.powersyncexample-Ncpon4RAkqsH93jLpCnJug==/lib/arm64
02-06 11:02:09.795 11420 11420 E SoLoader: 	SoSource 0: com.facebook.soloader.ApkSoSource[root = /data/data/com.anonymous.powersyncexample/lib-main flags = 1]
02-06 11:02:09.795 11420 11420 E SoLoader: 	SoSource 1: com.facebook.soloader.DirectorySoSource[root = /data/app/~~YNwv-FhK51L6KHXdxruLGA==/com.anonymous.powersyncexample-Ncpon4RAkqsH93jLpCnJug==/lib/arm64 flags = 0]
02-06 11:02:09.795 11420 11420 E SoLoader: 	Native lib dir: /data/app/~~YNwv-FhK51L6KHXdxruLGA==/com.anonymous.powersyncexample-Ncpon4RAkqsH93jLpCnJug==/lib/arm64
02-06 11:02:09.796 11420 11420 V SoLoader: libhermes.so not found on /data/data/com.anonymous.powersyncexample/lib-main
02-06 11:02:09.797 11420 11420 D SoLoader: libhermes.so found on /data/app/~~YNwv-FhK51L6KHXdxruLGA==/com.anonymous.powersyncexample-Ncpon4RAkqsH93jLpCnJug==/lib/arm64
02-06 11:02:09.800 11420 11420 V SoLoader: libhermes_executor.so not found on /data/data/com.anonymous.powersyncexample/lib-main
02-06 11:02:09.800 11420 11420 D SoLoader: libhermes_executor.so found on /data/app/~~YNwv-FhK51L6KHXdxruLGA==/com.anonymous.powersyncexample-Ncpon4RAkqsH93jLpCnJug==/lib/arm64
02-06 11:02:09.842 11420 11449 V SoLoader: libfbjni.so not found on /data/data/com.anonymous.powersyncexample/lib-main
02-06 11:02:09.842 11420 11449 D SoLoader: libfbjni.so found on /data/app/~~YNwv-FhK51L6KHXdxruLGA==/com.anonymous.powersyncexample-Ncpon4RAkqsH93jLpCnJug==/lib/arm64
02-06 11:02:09.843 11420 11449 V SoLoader: libflipper.so not found on /data/data/com.anonymous.powersyncexample/lib-main
02-06 11:02:09.843 11420 11449 D SoLoader: libflipper.so found on /data/app/~~YNwv-FhK51L6KHXdxruLGA==/com.anonymous.powersyncexample-Ncpon4RAkqsH93jLpCnJug==/lib/arm64
0

[DominicGBauer]

@joshsmith we are in the process of moving this demo into our new powersync-js repo under the demos. Expo has been updated to version 50 in the migration process :) and we will be archiving this repo soon. Thanks a lot for your effort!