feat(android) add Fastlane metadata

Fix https://github.com/jitsi/jitsi-meet/issues/11786

metadata/en-US/full_description.txt

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+Jitsi Meet lets you stay in touch with all your teams, be they family, friends, or colleagues. Instant video conferences, efficiently adapting to your scale.
+
+* Unlimited users: There are no artificial restrictions on the number of users or conference participants. Server power and bandwidth are the only limiting factors.
+* No account needed.
+* Lock-protected rooms: Control the access to your conferences with a password.
+* Encrypted by default.
+* High quality: Audio and video are delivered with the clarity and richness of Opus and VP8.
+* Web browser ready: No downloads are required of your friends to join the conversation. Jitsi Meet works directly within their browsers as well. Simply share your conference URL with others to get started.
+* 100% open source: Powered by awesome communities from all over the world. And your friends at 8x8.
+* Invite by pretty URLs: You can meet at the easy to remember https://MySite.com/OurConf of your choice instead of joining the hard to remember rooms with seemingly random sequences of numbers and letters in their names.

metadata/en-US/short_description.txt

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+Secure, Simple and Scalable Video Conferences with state-of-the-art video quality