[Story] EX: Incoming device verification request

[manuroe]

Description

• As a user
• I want to use EX to verify a new login that happened on another matrix client.
• So that I can verify any new login using EX instead of depending on another matrix client like EW to do so

Leads

• Tech: @stefanceriu
• Design:

Acceptance criteria

• EX detects and displays incoming verification request
• The user can successfully verify the new login using EX

Size estimate

None

Dependencies

• None

Out of scope

• QR code login. Displaying a QR code on EX will happen later.

Open questions

### Questions

Subtasks

### Android
- [ ] https://github.com/element-hq/element-x-android/issues/3120

### iOS
- [ ] https://github.com/element-hq/element-x-ios/issues/1227

### Rust
- [ ] https://github.com/matrix-org/matrix-rust-sdk/issues/3595

### Other