[Message actions] New UI for replies (#545)

* Add 'reply to' UI to the message composer.

* Move the `BlurHashAsyncImage` to `:libraries:designsystem` as it is now used in several modules.

*  Create reusable `AttachmentThumbnail` and associated data classes and enums, it's now added to `:libraries:matrixui`.

* Re-use `AttachmentThumbnail` in a `ActionListView` and `TextComposer`.

* Add 'inReplyTo' models and UI.

* Add min size for images

* Create a separate layout for media items with no reply to info. Also, separate `Timeline__Row` components from `TimelineView`, as it was getting too large.

* Added `EqualWidthColumn` to use inside message bubbles. Also fixed some modifiers for media items replying to other messages.

* Disable `inReplyToClicked`.

* Remove unused resources and libraries.

* Remove any traces of `BlurHashAsyncImage` in `:features:messages`, since it was moved to the design system.

---------

Co-authored-by: ElementBot <benoitm+elementbot@element.io>

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