Feature/bma/link in topic

[bmarty]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

Make link in room topics clickable

Motivation and context

Fixes #612

Screenshots / GIFs

Include in the PR

Tests

• Add a link to a room topic
• Click on the link from the room detail page
• The link is opened in the external browser

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/vector-im/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request includes a new file under ./changelog.d. See https://github.com/vector-im/element-x-android/blob/develop/CONTRIBUTING.md#changelog
• 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

[jmartinesp]

LGTM!

[github-actions]

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