feat: add smart banner support

[reallybeard]

Description

• Add meta tag for iOS
• Add the relevant info in the manifest for android (https://stackoverflow.com/questions/55838392/how-exactly-are-we-supposed-to-implement-the-native-app-install-prompt-for-chrom/66699710#66699710)

Notice

• [x] Have you followed the guidelines in our Contributing guide?
• [x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Pull Request Type

• [ ] :bug: Bug fix (Non-breaking Change: Fixes an issue)
• [ ] :hammer_and_wrench: Chore (Non-breaking Change: Doc updates, pkg upgrades, typos, etc..)
• [x] :nail_care: New Feature (Breaking/Non-breaking Change)

Issue (if applicable)

closes #3045

Risk

Should pose no real risk here, the app should function as normal even if these smart banners don't work

Testing

Engineering

We will need a fleak build to test if this is working like we think it is. Testing on both iOS and Android.

Operations

When on an iOS phone you should see a banner at the top with a link to download the native app.

On android you should see a prompt to install the native version of the app.

Screenshots (if applicable)

[reallybeard]

@0xdef1cafe can we turn on the fleak build for this PR so we can test it?