Import a missing key pair by scanning QR code for when inside wallet settings

[mohsen-ghafouri]

dependent on #20035

Feature Issue

User Story

As a user,
I want to be able to import a missing key pair by scanning a QR code while inside the wallet settings.

Description

Implement the UI and UX flow inside the wallet settings for scanning a missing key pair's QR code.

Designs

Figma flow: the Figma designs

Acceptance Criteria

Screen	Description
	Users can choose to view the key pairs and accounts settings (inside wallet settings) by pressing on the "Key pairs and accounts" menu button.
	Users should be able to see any missing key pairs and accounts. Missing key pairs and accounts would exist on other devices but not on the current device.
	Users should be able to open the action menu for a missing key pair. And a user should be able to press the "Import by scanning encrypted QR" action
	If a user needs to allow for camera permissions, they should see the "Enable camera" screen.
	When a user attempts to enable the camera, they will need to allow the Status app to use the camera.
	When a user has enabled the camera, then a user can scan a key-pair's encrypted QR code. Note that the user will need to authenticate this action.
	When a user attempts to import a key pair, if the QR code is not the correct key-pair QR code, then the user should see a toast describing the error.
	When a user attempts to import a key pair, if the QR code has already been used, then the user should see a toast describing the error.
	When a user attempts to import a key pair, if the QR code is not for a key pair, then the user should see a toast describing the error.
	When a user has successfully imported a key pair, then the user should see a toast confirming the success.
	A user should see the success toast disappear and see the imported key pair.