Add url previews with youtube embed player & room list avatar option

[BatteredBunny]

Description

• Adds url preview option

• Special case for youtube

• Adds room list avatar option

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

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[Airyzz]

I think if the YouTube embeds should be implemented in a more generic way to make it easier to expand and add new embeds for more platforms later, as well as Matrix's URL Previews

[BatteredBunny]

I think if the YouTube embeds should be implemented in a more generic way to make it easier to expand and add new embeds for more platforms later, as well as Matrix's URL Previews

I have thought about url previews, decided to leave them for a seperate pull request, YouTubeEmbed compontent is simple enough i don't think there will be a problem adapting it to something else like Reddit or Twitter

[github-actions]

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