Per room block unverified devices

[BillCarsonFr]

Type of change

• [x] Other : Parity with web

Fixes #6725

Content

Adds the option to only send keys to verified devices per room. The setting was ready in SDK but just not exposed in UI.

Also added UI feedback when the option is on in global settings.

Motivation and context

Screenshots / GIFs

Per room setting off	Per room setting on

Global Blacklist on and unverified devices in room	Global blacklist on all is ok

Tested devices

• [ ] Physical
• [x] Emulator
• OS version(s):

Checklist

• [x] Changes has been tested on an Android device or Android emulator with API 21
• [x] UI change has been tested on both light and dark themes
• [x] Accessibility has been taken into account. See https://github.com/vector-im/element-android/blob/develop/CONTRIBUTING.md#accessibility
• [x] Pull request is based on the develop branch
• [x] Pull request includes a new file under ./changelog.d. See https://github.com/vector-im/element-android/blob/develop/CONTRIBUTING.md#changelog
• [x] Pull request includes screenshots or videos if containing UI changes
• [ ] You've made a self review of your PR
• [ ] If you have modified the screen flow, or added new screens to the application, you have updated the test UiAllScreensSanityTest.allScreensTest()