Handle Play Store links

[AaronMT]

User Story

• As a user, when I click on a link to download/open an app, I want my browser to give me the option to download the app from the Google Play Store or open the app if I already have it installed, so I can easily choose to download/access an app.

Acceptance Criteria

-I can choose to download an app when I click on a download/open link on a website
-I can choose to open an installed app when I click on a download/open link on a website

Examples:

• Visit http://imgur.com
• Tap 'Get App'

┆Issue is synchronized with this Jira Task

[AaronMT]

Another, e.g, http://newegg.ca, tap View on the top banner

[ekager]

This also currently does not work in reference browser. We could probably add some logic dealing with these external URIs and launch an intent in AppRequestInterceptor https://github.com/mozilla-mobile/fenix/blob/master/app/src/main/java/org/mozilla/fenix/AppRequestInterceptor.kt

But there is also an issue open in AC about this issue: mozilla-mobile/android-components#1132

And one open in Reference Browser: mozilla-mobile/reference-browser#279

Because most browsers will want this functionality, maybe this is something that should be in AC.

[uniquePWD]

Any chance this could get a more meaningful title so that it's easier to locate? Handle Play Store links is incredibly specific.

[vesta0]

Blocked on mozilla-mobile/android-components#1132

[vesta0]

Will be addressed in #3177

[karlcow]

@ekager will this bug cover also the currently unknown schemes such as

<a href="mailto:[email protected]">Bariton</a>

Because of a couple of issues have been closed against this one and this bug doesn't make it clear if it's only intent:// scheme or any scheme.
Thanks.