Rewrite Shields popover UI in SwiftUI

[cuba]

Description:

The code is old and very limited by Static. Replacing this screen will make it easier to implement features such as standard/aggressive ad-blocking

[Uni-verse]

Verified on iPhone X running iOS 16.3.1using version 1.51.1 (23.5.19.19)

Test Plan: https://github.com/brave/brave-ios/pull/7354#issue-1687214419

Tracking and Ads Blocking

- Verified `Tracking & Ads Blocking` setting is set to standard by default. Tapping on the setting will show dropdown menu. - Verified setting Tracking & Ads Blocking to `Aggressive` or `Disabled` will update setting accordingly. Ad blocking toggle will be disabled in Brave shields panel if set to `Disabled` in global settings Example | Example | Example -|-|-  |  |  - Verified ads are blocked by default on `youtube.com` and news sites like `buzzfeed.com.` - Verified disabling shields or ad blocking toggle will enable preroll ads and content ads to be shown. Example | Example | Example -|-|-  |  | 

Privacy Settings preference

- Verified re-launching app or navigating in and out of settings does not change set toggle preference. - Verified enabling/disabling toggle does not change other toggles/settings. - Verified enabling `Block all cookies` shows a confirmation and setting is reverted on cancel.

Data, Privacy Hub, PBM

- Verified deleting data using `Clear Data Now.` - Verified that "Private browsing only" shows a confirmation and if cancelled the setting is reverted and nothing happens and when accepted a loading indicator appears and after its loaded non-private tabs are destroyed. - Verified navigating to `Manage Website Data`, as well as manual removing items, clearing all data using `Remove All.` - Verified navigating to `Privacy Hub` settings, as well as clearing shields data. - Verified clear data toggles are remembered after clearing data in privacy settings. Example | Example | Example -|-|-  |  | 

Block 'Switch to App' Notices

- Verified switch to app dialogs are blocked when toggle is enabled. - Verified switch to app dialogs are shown with shields down when toggle is still enabled. - Verified `Block 'Switch to App' Notices` is tied to `Fanboy's Mobile Notification` toggle in Content filter lists. Disabling one will affect the other. Example | Example | Example -|-|-  |  |   |  | 

Fingerprinting

- Verified fingerprinting is working on iOS using test plan in https://github.com/brave/brave-ios/issues/7231#issue-1664912095 Example | Example | Example | Example | Example | Example -|-|-|-|-|-  |  |  |  |  | 

Block Cookie Consent Notice

- Ensured enabling `Block Cookie Consent Notices` will hide all cookie notices - Ensured bringing shields down or disabling `Block Cookie Consent Notices` will show cookie notices (disable cookie consent notices blocking) Example | Example | Example -|-|-  |  | 

Safe Browsing

- Verified warning interstitial page is shown when loading dangerous sites using https://testsafebrowsing.appspot.com/ - Verified user is able to navigate back from the warning page - Verified disabling `Block Dangerous Sites` will not warn users when loading dangerous sites Example | Example | Example -|-|-  |  |   |  | 

Debouncing / DeAMP

- Verified Debouncing / DeAMP scenarios following test plan in https://github.com/brave/brave-ios/issues/5730#issuecomment-1428651981 Example | Example | Example -|-|-  |  | 

Upgraded Profile

- Verified upgrading app with ad-blocking toggle enabled (default) will retain preferences and show `Standard` state after upgrade. - Verified ad-blocking is working on upgraded profile - Verified upgrading app with ad-blocking toggle disabled will show `Disabled` state for `Trackers & Ads Blocking`

[Uni-verse]

Verified on iPad (7th Gen) running iPadOS 16.3.1 using version 1.51.1 (23.5.19.19)

• Verified Tracking & Ads Blocking is set to Standard by default on fresh profile
• Verified Ads are blocked on iPadOS with default Ads Blocking settings
• Verified disabling Tracking & Ads Blocking toggle will be retained on upgraded profile
• Verified per site shields settings are retain on existing profile

Settings	1.51	1.51	1.51.1	1.51.1