Feat/google maps key

[cnguyen812]

• added support for GOOGLE_MAPS_API_KEY in .env files and replacement scripts
• updated Android build script to set and reset .env replacement scripts as pre- and post-build scripts
• added checks so replacement doesn't occur if env value is falsey
• updated script command from android:build:release to build:android:release for consistency

Key scripts:

• yarn set:dev/yarn set:prod to set the dev/prod stuff, mainly inject the env variables into the appropriate files
• yarn reset:dev/yarn reset:prod to reset the dev/prod stuff back to commit state
• yarn build:android:release/yarn build:android:debug builds the android apk with the dev/prod keys injected but also resets them afterward