[Feature]: Rewrite settings using SwiftUI

[tmolitor-stud-tu]

Precondition

• I understood that this template is only for feature requests and not for bug reports

Cross-checked related issues?

• I have cross-checked this overview Overview: Tasks and Issues #322 as well as filtered for related labels https://github.com/monal-im/Monal/labels

Describe your feature

Currently half of our settings UI is still using UIKit. Rewrite these parts to use SwiftUI.

• Server details (MLServerDetails.m)
• Change password (MLPasswordChangeTableViewController.m)
• Blocked Users (MLBlockedUsersTableViewController.m)
• Add account (advanced) (XMPPEdit.m)
• Sounds including support for custom sounds and per-contact sounds (based on heavily improved PR Finished Allow custom sounds per sender #991 #1032)
• Settings itself, including account list
• Move list of settings under "General settings" to main settings menu once it's written in SwiftUI

[tmolitor-stud-tu]

@lissine0

[lissine0]

I'm working on this issue.