chore: update android target SDK to 30

[patogallaiovlabs]

Description

• Change the Android API target SDK from 29 to 30.
• Remove Google API key from repo (iOS).
• Minor code style to iOS Firebase config.

Motivation and Context

Play Store message:

New Android App Bundle and target API level requirements in 2021 Mar 22, 2021 21:00

Starting August 2021, new apps will be required to target API level 30 (Android 11) and use the Android App Bundle publishing format. Starting November 2021, all app updates will be required to target API level 30 (Android 11). Apps with a download size of more than 150 MB are now supported by Play Asset Delivery and Play Feature Delivery.

How Has This Been Tested?

Building and running the app, doing some basic navigation and some basic transactions.

Types of changes

• [ ] fix: bug fixes, e.g. fix Button color on DarkTheme.
• [ ] feat: new features, e.g. add Snackbar component.
• [ ] refactor: code refactor, e.g. new folder structure for components.
• [ ] docs: changes into documentation, e.g. add usage example for Button.
• [ ] test: adding or updating tests, eg unit, snapshot testing.
• [X] chore: tooling changes, e.g. change circleci config.
• [ ] BREAKING CHANGE: for changes that break existing usage, e.g. change API of a component.

Checklist:

• [ ] My code follows the code style of this project.

• [X] My change requires a change to the documentation.

• [X] I have updated the documentation accordingly.

• [ ] Tests for the changes have been added (for bug fixes / features)

• Other information: We remove the error when Android SDK 11:

Note: When syncing project with gradle files using Android SKD 11, it throws the following error:

No variants found for ':@imstar15_react-native-firebase'. Check build files to ensure at least one variant exists. at: