Rework room summary

[ganfra]

Content

This PR takes care of 3 things :

• Do not use RoomSummary directly in the ui model, so creates new models when necessary
• Let RoomSummary uses RoomInfo directly instead of mapping partial data.
• Rework the getRoomInfoFlow to not use getRoom internally.

Motivation and context

Better code and prepare work for knocking feature.

Screenshots / GIFs

Tests

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Tested devices

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

Checklist

• [ ] Changes have been tested on an Android device or Android emulator with API 23
• [ ] UI change has been tested on both light and dark themes
• [ ] Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• [ ] Pull request is based on the develop branch
• [ ] Pull request title will be used in the release note, it clearly define what will change for the user
• [ ] Pull request includes screenshots or videos if containing UI changes
• [ ] Pull request includes a sign off
• [ ] You've made a self review of your PR