iOS app for Inji

[rakhimosip]

Problem statement:
Residents with iOS devices should be able to use Inji to download their digital credentials and view and share them with others.

Proposed solution:
In order to support iOS devices, we will be using Google Nerby Messages API which requires internet connectivity.

2 modes will be introduced in the app when it is requesting for VC -> Offline and Online

Offline mode - uses Google Nearby Communications which does not require internet connectivity
Online mode - uses Google Nerby Messages API which requires internet connectivity

These modes will be available in both android and iOS apps.

Implementation details:
idpass#94 (comment)

A demo video of cross-platform sharing is available here
It shows sharing and receiving of credentials between android and iOS devices.

Acceptance criteria:

• A resident should be able to download, install, and set up Inji on their iOS device.
• A resident should be able to use their UIN/VID to download digital credentials on their phone and view the details.
• A resident should be able to share and receive credentials from an iOS device to another iOS device.
• A resident should be able to share and receive credentials from an iOS device to an android device.
• A resident should be able to share and receive credentials from an android device to an iOS device.
• When both the sharer and receiver are using android apps, they should be able to share and receive credentials without any internet connectivity.
• Between a sharer and receiver even if one of the devices is iOS, sharing and receiving will not be possible without internet connectivity.
• Except for the offline/online modes, all other features of the iOS app should be similar to the android app.

Supported versions:
iOS 12 and above

Differences between the iOS and Android Inji apps:
https://drive.google.com/file/d/1Uyx0M2e5_70UCcHJoHC3MouWIuz2oMG7/view?usp=sharing

Linked tasks:
idpass#130
idpass#94
idpass#129
idpass#151

[Anushree09-N]

Verified the story in GNB build and iOS sharing was working on both iOS<->iOS , iOS<->Android and Android<->iOS in online mode. Online switch is no more valid in BLE build hence closing.