Update Expo to SDK 51

[h1divp]

In recent months expo has updated its SDK twice, as well its corresponding apps both available on iOS and Android, which we use for development and testing.

The problem is, these apps cannot be reverted to previous versions which use our current SDK (49). Therefore, anyone who tries to test Echo will not be able to even if they follow all correct procedures for setting up the app for development. Therefore two full SDK updates will be needed (yes, sequentially) with necessary package upgrades. The fixing of this issue is vital for continuing easy development and onboarding to Echo.

Current workaround

Currently the only known workaround to develop the app is done by installing an SDK 49 version of the Expo mobile app on a simulated android phone, in android studio. Maybe you can find a way to use this on a regular android phone, but I believe the certificate for the version has expired and is not able to be installed on most devices.

Task

Please follow expo documentation and update the SDK version of our frontend app sequentially. Update all necessary NPM packages to their required versions. Once you have the app working in the most current version, please take note of any bugs from the upgrade and mention them in the PR. These may be created as subsequent issues.