feat: fastlane pipeline for Google Play & finalize 9.0.4

Issue being fixed or feature implemented

Bump the version
Add changelog
Add a script to generate a changelog in a fastlane-friendly manner: .deploy/prepare_changelog.sh. The script will parse the gradle file for the build number and will open nano to fill in the changelog for different languages.
Add several pipelines for build/upload. Available pipelines: fastlane build storepass:[keystore password] keypass:[key password] - builds the production version of the app. fastlane upload - uploads existing wallet-prod-release.apk file to the internal test track. fastlane publish storepass:[keystore password] keypass:[key password] - run build and upload together. fastlane promote rollout:0.5 - promote to production with 50% rollout (20% by default if no args) fastlane increase rollout:0.7 - increase rollout to 70%

For the pipelines to work, app-distribution-key.json and dash-wallet.keystore files have to be put inside the .deploy folder.

[ ] I have performed a self-review of my own code and added comments where necessary
[ ] I have added or updated relevant unit/integration/functional/e2e tests