UI Redesign - Mobile - Trusted Senders

[Jainakin]

- What I did
Created a new UI design for the trusted senders screen and a remove trusted sender dialog which closes #222

- How I did it
I created a new screen for the trusted senders screen inside the trusted_senders_screen folder

- How to verify it
add the code to the welcome screen and you should be able to click the floating action button to view the new screen

floatingActionButton: FloatingActionButton(
    backgroundColor: const Color(0xFFF05E37),
    child: const ImageIcon(
        AssetImage("assets/images/add_icon.png"),
        color: Colors.white,
        size: 16.0,
    ),
    onPressed: () {
        showModalBottomSheet<dynamic>(
            isScrollControlled: true,
            shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(20.0),
            ),
            context: context,
            builder: (BuildContext context) {
                return TrustedSendersScreen();
            },
        );
    },
),

- Description for the changelog
Added Trusted Senders Screen and Dialog

[Jainakin]

Hey @ksanty, I have completed my assigned task. Can you please check it and give me feedback for corrections if any.
Thank You

[tinashe404]

We need your work to be going to the redesign branch, not the trunk branch.